engine knock |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Curious to know what brand head gaskets did you use? Marine?
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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yes, I removed all plugs and turned it by hand, fine. also gave it some turns with the starter and moved fine, nothing strange according to my mechanic...
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<a href="">1992 ski nautique
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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Could you put a large breaker bar/ratchet on the crankshaft pulley and give it a couple of turns and see if you see any erratic movement? Just don't loose track of piston timing/location.
Or maybe with the starter? Be sure to disconnect/pinch off fuel going to the fuel pump. |
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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to this point my friend and mechanic, wants to check the head, fix it and put it again...and see what happens...
or should a i just remove the engine and see whats going on from below... |
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<a href="">1992 ski nautique
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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I was just going to ask that. Curious as to why there would be a knock unless the cylinder was filled with water or something. |
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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now why the knock? the blown gasket? or piston slap?
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<a href="">1992 ski nautique
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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just came from there...
bitter... First pulled the exhaust manifold complete found rust on exhaust ports on #2 and #3 cylinder, so I undo de riser, and looks like the gasket was bad and leaked water into those cylinders after shut off. I will test anyway to see if I have a cracked water jacket in the manifold. Then removed the valve cover and all plugs and turned the engine. Valves close fine. Removed the Cylinder head...geez, found the problem..blown head gasket between #2 and #3. Strange as compression on 3 was fine. Little scuff on cylinder 3. Looks like at some point overheated @ wot (didn´t notice it) and voila failure. I´m taking the head to the machine shop to test for cracks and see the valve and seats on 2 and 3 cylinders. |
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<a href="">1992 ski nautique
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Luchog
Grand Poobah Joined: April-17-2007 Location: Argentina Status: Offline Points: 2135 |
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Seb, any news?
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lewy2001
Grand Poobah Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234 |
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Kap that is bad news. At least you should have Bully there soon to help you with the spanner work.
What rpm's are you pulling footing? I would check your total ignition advance at those rpms and maybe wind it a back a few degrees for safety with varying fuel quality. |
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If you're going through hell, keep going
89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
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gun-driver
Grand Poobah Joined: July-18-2008 Location: Pittsburgh, Pa Status: Offline Points: 4112 |
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Kap,
It could have been bad gas!! Last year I had the tips blown off 3 plugs from bad gas. Luckly my motor has a knock sensor and wouldn't let it go above I think it was 2,800 rpm. Long story short I would hate to think what would have happened if I was able to run it at full rpm. Oh by the way I was running Startron in the fuel at the time. I WON'T EVER BUY THAT CRAP AGAIN back to Stabil marine and no more problems. |
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storm34
Grand Poobah Joined: November-03-2008 Location: Dexter Iowa Status: Offline Points: 4492 |
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Kao, hopefully it's something minor! Keep us updated and let us know what you find |
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jimsport93
Platinum Member Joined: February-20-2008 Location: Alpharetta Ga Status: Offline Points: 1749 |
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Man! Kap you sure have had your share of problems this year. Cheer up..you will get it figured out. In the meantime I quess it is sun-bathing on the bow of your freinds cruiser. Seem to remember some good pics from past outings on the cruiser!
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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today I was looking at the ngk plugs I had on the engine prior to replacing them with the autolite 764 around 6-7 months ago...I mark them from whick cylinder they came out. By that time they where all looking good, so the problem arrised in this last outings, probalbly bad gas @ wot....
i can´t work on the boat during the week ends, not permited by the marina, so probably till next week until I´m able to start pulling the engine appart... Only 1 week from this problem and i´m starting to suffer boat withdrawal symptoms.... |
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<a href="">1992 ski nautique
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GlassSeeker
Grand Poobah Joined: November-26-2008 Location: Elk Grove, CA. Status: Offline Points: 2421 |
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That sounds like a good plan. That may tell more than just tearing into it. Just the fact that it is still rotating is a good thing.
We had a Mastercraft way back when and it was bought brand new, it had a 200 hour warranty, at 211 hours we blew a hole about 1 1/2 inches in the center of a piston, had to replace the piston and we got it back up and running again. The theory was a lean condition. Later the whole top deck worked the pop rivets loose and detached from the bottom/hull. That was real special. That was when we went to a BFN. When the BFN had somewhere near 3000 hours we rebuilt it, on teardown the piston skirts were detached/broken off and being held in place by the rings. Willies Malibu detonated at 5200 rpms at 800 hrs and had major damages, hole in block from the rod into the water jacket...when I pulled the head there was no piston left the rod looked like a hammer had beat it for hours. Roy was driving and he said the sound was something he would not forget. I've got my fingers crossed that yours will be a fairly minor repair, you may have caught it before the real bad stuff has happened. |
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This is the life
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Luchog
Grand Poobah Joined: April-17-2007 Location: Argentina Status: Offline Points: 2135 |
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What we talked on the phone today I also suggested Seb to take the valve cover off and move the engine by hand to see the valves open and close see if one's stuck or there's a bent pushrod. We need to find out WHY the plug burnt, and then head to see what else broke and WHY so it doesnt happen again. Anyway the head must come off and most likely the engine as well. |
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Waterdog
Grand Poobah Joined: April-27-2006 Location: United States Status: Offline Points: 2020 |
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Hay Kap, The 30 seconds before it lets go is always the best it EVER ran. Keep your head up, ya know if we could wrench on it with you we would be there. Thats what makes this site that Keith created sooo cool. (Thanks for bringing us together Keith - get well soon!) The 4 wide nats at Z Max dragway was last weekend. Google "Mat Hegan explosion" hard to believe you could live through that!!! |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Seb,
I'm sorry to hear about the problem - it sucks! Just keep moving forward. Get that head off and I know you will report back to us. |
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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wow, auto bad words deleting!
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<a href="">1992 ski nautique
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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Engine ran sooo good, guess *************** happens...
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<a href="">1992 ski nautique
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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looks like my back deeps will be put on hold until this is solved...
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<a href="">1992 ski nautique
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crobi2
Senior Member Joined: April-05-2011 Location: Texas Status: Offline Points: 112 |
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Darn! I'm sorry. I remember watching your video on utube when you built that motor. That was before I even knew about this site.
Hope you get it fixed quick. |
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C-Rob
2000 SAN |
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Waterdog
Grand Poobah Joined: April-27-2006 Location: United States Status: Offline Points: 2020 |
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Knock under load, = rod bearing.
With low comp on #2 and bad plug, rip the haed off - fix what ya find. Hard to guess, but when you pull the head you'll know. Good luck, hope it don't cost too much! |
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GlassSeeker
Grand Poobah Joined: November-26-2008 Location: Elk Grove, CA. Status: Offline Points: 2421 |
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good that you have oil pressure, maybe you have caught this in time to keep repairs to a minimum---stuff happens. sorry that you are having engine issues. its a bummer but keep your chin up and take care of business. I don't think you can blame high engine speeds unless it was over reving. 4500-5000 rpms really is not high rpms in the big scheme of things, pulling 1 footer is not over loading anything. bad gas? maybe, bad component? maybe.
take a deep breath and tackle the problem. Once again very sorry, it sucks no matter what, it just sucks. |
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This is the life
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5696 |
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Well we will know when we know but heat/detonation/bad gas type issues is my best guess. You could have stuck a valve, dropped a seat, or cracked/blew up or melted a piston. A little too much timing and/or less than ideal gas can cause/facilitate any of those things. They can happen pretty quick or overtime at barefoot speeds and loads.
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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just came from the boat, I´m upset.
Hooked the oil pressure gauge, 60 idle upon start and raises when you hit the throtle. I have low compression on #2 cylinder. around 60-70. rest is in the upper 150´s... Plug on that cylinder was destroyed, the electrode gone, though I got a pictures but no. Strange is when I got that out, after inspecting it I found traces of water in the spark hole...and some drips in the engine mount that sit below there. But when cranking the engine, no water came from there. No water in oil. Rest are fine. Knock is there under load from 2000 rpm and keeps there. on neutral you can no noise... So will need to start tearing appart that head and see first valve problems or what... Seems the knock if from the upper engine, and not from below as i suspected.... Really don´t know what could have failed...only 250 hours from rebuilt, all oil changes on time, correct plugs.... Mechachic blames barefooting and the high engine speeds as culprits (joking of course), but I really don´t think so. Probably will start the tear down by next week... |
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<a href="">1992 ski nautique
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GlassSeeker
Grand Poobah Joined: November-26-2008 Location: Elk Grove, CA. Status: Offline Points: 2421 |
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I'm hoping for the best outcome, after having 3 bad engines in a row I know the feeling all too well. Hopefully it turns out to be something minor.
take a long piece of pipe or a broom handle or long screw driver or a mechanics stethescope to listen and locate the source. Good luck. |
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This is the life
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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yes thats another place I wanted to check...
its pretty new though, replaced it when i rebuilt the engine... |
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<a href="">1992 ski nautique
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NEDLUTZ
Groupie Joined: November-26-2007 Location: Seekonk Ma. Status: Offline Points: 69 |
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Check your flex plate...
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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Brian, I would be glad if this was the case, but this was no exhaust leak at all, this was coming from the guts of the engine...
actually i´m dealing with a exhaust leak on the vette, as 1 manifold bolt made its way out and its blowing there, totally different sound... |
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<a href="">1992 ski nautique
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watrski
Senior Member Joined: December-01-2010 Location: Chippewa Lake Status: Offline Points: 393 |
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Take it off, look at it very closely. You might see a very faint mark where it is arcing between 2 cylinders. If you have a new cap....you can throw it on.
Happened to me...thought my motor was toast! |
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