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OMC 250 (chevy 350) cooling System |
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almabes 
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Joined: March-20-2008 Location: Acworth GA Status: Offline Points: 263 |
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 Posted: August-10-2009 at 12:18am |
Unless I am mistaken, raw water cooled GMs run a 145 degree thermostat. with a 160 the motor will get too hot. |
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'76 Martinique PCM 351W |
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almabes
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Posted: August-10-2009 at 12:39am |
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From what I see at various purveyors of OMC parts, I am, indeed mistaken. 160 degrees is the appropriate temperature thermostat.
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favorite computer wisdom: net helpmsg 4006
'76 Martinique PCM 351W |
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jdmack0208
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Joined: July-12-2009 Location: Hope Mills, NC Status: Offline Points: 72 |
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Posted: August-10-2009 at 12:41am |
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Cool, thanks....I will let you guys know what I come up with tomorrow. I will take the laptop out there with me and update this thread.
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almabes
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Posted: August-10-2009 at 12:42am |
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Oh no...I'm working from home tomorrow...I guess that means I'm really checking this thread tomorrow.
Good luck. I've learned more about OMC inboards than I've ever thought I would. |
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favorite computer wisdom: net helpmsg 4006
'76 Martinique PCM 351W |
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jdmack0208
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Posted: August-10-2009 at 12:44am |
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Well on a positive not, the boat ran strong until it overheated. No more bogging out. It never planed out though, what would be the reason for that? Speed?
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jdmack0208
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Posted: August-10-2009 at 12:49am |
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Don't worry though I have plenty of other stuff to fix(tach, speedo, depth gauge etc...)so plenty more threads coming and you'll learn a lot more!
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eric lavine
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Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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Posted: August-10-2009 at 10:13am |
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im taking my camera today and will snap a pic of a similar omc, it should give a general idea of hose routing
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"the things you own will start to own you"
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almabes
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Posted: August-10-2009 at 4:01pm |
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OMC:
Obviously More Complicated? |
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favorite computer wisdom: net helpmsg 4006
'76 Martinique PCM 351W |
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boat dr
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Posted: August-10-2009 at 6:03pm |
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OMC
Other Motor Company |
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almabes
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Posted: August-10-2009 at 10:08pm |
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OMC:
Only More Confusion! |
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favorite computer wisdom: net helpmsg 4006
'76 Martinique PCM 351W |
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almabes
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Posted: August-11-2009 at 4:51pm |
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Josh,
Any luck running her on the hose? |
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favorite computer wisdom: net helpmsg 4006
'76 Martinique PCM 351W |
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jdmack0208
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Posted: August-11-2009 at 11:22pm |
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I have all the thermostat and gasket but I got off work late last night and today it is raining so maybe I will get them in tomorrow.
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eric lavine
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Posted: August-12-2009 at 10:24am |
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I looked and it doesnt have half of the hoses you have. i dont think it will help
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"the things you own will start to own you"
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almabes
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Posted: August-12-2009 at 12:13pm |
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I have sent an e-mail to a marine mechanic friend of mine, and asked him to take a look at the pictures.
Hopefully he can help figure out the plumbing. |
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favorite computer wisdom: net helpmsg 4006
'76 Martinique PCM 351W |
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jdmack0208
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Posted: August-14-2009 at 12:45am |
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Ok here is the link to the manifolds I have, the file is a PDF and I don't know how to post it.
http://barrmarine.net/wordpress/omc-v8-4/ And here is the link to the risers: http://www.oscomotors.com/catalog/catalog31.asp It doesn't say anything about closed cooling system. I don't know, it won't stop raining here for me to get out there and hook everything up. |
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jdmack0208
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Posted: August-14-2009 at 12:47am |
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This is what I got from the guy that the guy I bought the boat from got it from(say that three times fast!) Not much help but at least he cares enough to email me back.
"Hey I believe there were 2 holes on the front of the old manifolds and the hoses went to the thermostat. I assume a newer style is being used now as the old one is no longer being made. You will probably have to get a different thermostat housing. Go to correct craft fan site and ask for a picture or to the manufaxcturer of the new system and ask for a thermo. matching the one you are using." |
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boat dr
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Posted: August-14-2009 at 2:43am |
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CorrectCraftParts has a set of used OMC late style manifolds for sale. Call Karen for prices and shipping. These are not after market fit all manifolds, but the real deal. 1-318-299-8547
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jdmack0208
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Posted: August-15-2009 at 4:19pm |
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Ok so the boat is running on the hose, did not heat up and I left it running at idol for 20 minutes. Water is coming out of the exhaust as it should. The manifolds fluctuated from warm to cool, I don't know if that is normal or not. I am gonna have to buy a new t-stat housing because I couldn't seem to get the crack completely sealed. Gonna throw some more permatex on it and see if I can get is controlled. Of course the JB weld didn't hold once I tightened down the bolts. Researching the t-stat housing now.
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Luchog
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Posted: August-15-2009 at 9:59pm |
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I'm glad you figured it out!!
Now, I think you can do well with any chevy 350 housing, just that you might have to cover all those holes on your manifolds! by the way, how did you do it? |
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almabes
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Posted: August-16-2009 at 9:39pm |
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Between Josh, myself and marine mechanic friend of mine we determined that four of those holes were extra, and basiclly adding confusion instead of helping cool the engine. They're probably there to accomodate a closed cooling system. Josh plugged all the extra holes in the manifolds with 3/4" NPT pipe plugs. It's more like the raw water colled PCM center rise pyramid setup now.
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favorite computer wisdom: net helpmsg 4006
'76 Martinique PCM 351W |
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jdmack0208 wrote: