help on 1990 351 pcm

ran great before work i did!!!


why did you replace anything then? i think i have seen this here before when someone replaces a bunch of things and when they try to run it, it doesn't run. now you have changed so many parts at one time you don't know where your problem is.

Pete, I think it's a flow chart...no pun intended.

Dan, I have a 1990 Nautique, also and recently converted to electronic ignition using a breakerless ignition kit that Skidim (Discount Inboard Marine) sells for Prestolite distributors. So far, so good.

If you do the conversion, be sure and get the correct kit for your distributor and the correct ignition coil for the kit - and pay close attention to the kit instructions with respect to the ballast resistor. Some conversion kits use it, and others do not.

If the boat sat in an outdoor storage facility for 3 years, there may be some varnish and/or corrosion in the carb. If it's just varnish and/or trash, rebuild the carb using Holley kit no. 703-47 available from Amazon.com. (I'm assuming you have a Holley 4160 marine carb., part no. 0-80319-1.)

If the carb is corroded on the inside, most people will tell you it's time for a new one. Again, Skidim is a good place to buy it. Consider bunching your order (buying eveything you think you'll need) and entering one of the discount codes they offer (like "CCFAN") for a 10% discount.

In addition to the things you've already done, you may want to install a new fuel filter/cartridge and 143 degree thermostat which is what PCM recommends for boats equipped with raw water cooling.

Good luck and let us know how everything works out for you. It sounds like you got a nice deal on that boat.

8122pbrainard or anyone else that can teach me something:

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I am trying to understand my cooling system better ('95 SN, GT-40, PCM/Ford 351). So, correct me if I got it wrong. When the t-stat is closed/cold, water from the impeller/raw water pump goes straight out through the exhaust manifolds w/o going through the engine? Meanwhile the water already in the engine circuit, circulates through the engine, via the circualtion pump until it gets hot (~140 / 160 F depending on t-stat), at which time the t-stat opens (hot)allowing cool water in the engine circuit to cool it ?!?!?!   Looking at passages in my t-stat housing, it looked like some cool water would always flow through the engine circuit regardless if the t-stat was open or closed. Am I missing something?     

Tim, I'm surprised no one responded and I just now found the post with your question from the 21st. Don't know how I missed it.

Your understanding on the operation of the cooling system is right on the money!!

Only goes wrong when people don't drain the block and expect the bucket method to displace the water in the block...