PCM 351W hot start issue...
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=22073
Printed Date: June-26-2024 at 8:16am
Topic: PCM 351W hot start issue...
Posted By: 03geetee
Subject: PCM 351W hot start issue...
Date Posted: June-12-2011 at 12:28pm
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Hello,
Please dont scold me to bad as I am a fan of all boats including CCs. I own an 83 Mastercraft Stars and Stripes that I recently restored. I also posted this in the engine forum but was looking for the most exposure so I tried here as well. My PCM 351 has the dreaded hot start issue that I think is mainly the starters fault to blame. The boat has 2748 hrs on the original longblock (minus timing set) and runs really really strong. Carb is not leaking fuel into cylinders when shut off, never bogs, idles at 600rpm like butter and runs like a raped ape at WOT. Carb is newer within 3-4 years, ignition is electronic with newer cap, rotor, wires and autolite 24s gapped to .035. The batter cables from battery to block and relay to starter are all new. Grounds have been cleaned and checked to be tight. I am replacing the starter with an Arco permanent magnet the weekend of 4th of July, also tossing in a nice fresh Interstate 24 MHD and crossing my fingers that this helps my problem. The boat will fire up with 3 pumps in the morning like a champ, idle at 1200 or so til I blip the throttle then she is ready to go. Run it for any time after 10-15 mins under load and the boat when shut off will not start. Plugs will not foul out, I have checked them every single time, fuel is not the issue. I suspect the following but wanted your guys opinion to what you thought... -carb plate for choke may be not opening all the way upon restart (easy fix wire it open) -coil is getting hot and not supplying enough voltage to fire the boat. It is an oil filled internally resisted coil, I bypassed the stock external resister. -the gap on inside the ignitor inside the distributor is moving away when it heats up causing no spark energy. I want to see what coil you guys have been running if the coil is the issue which I suspect it is. Can you run a newer style e coil on these boats with success? Is there an epoxy filled coil that is the old canister style? Thank you for any help! Here is a pic of the boat.... 
JTR |
Replies:
Posted By: Luchog
Date Posted: June-12-2011 at 3:06pm
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have you checked for spark jump at the coil wire on the cap when this happens? ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=2095" rel="nofollow - 1980 Ski Nautique Commander 351W |
Posted By: Gary S
Date Posted: June-12-2011 at 3:24pm
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I'm not familiar with those starters,just make sure it'a a marine one. My Dads PCM boat was recalled due to the fact that the starter manufacture used a roll pin instead of a solid one. Sure looks like new in your pic's,nice work. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: Bri892001
Date Posted: June-13-2011 at 3:30pm
First, I gotta say, sweet boat, even though it's an MC 
Love the old Stars and Stripes, my neighbors used to have a blue one, which helped fuel my love of inboards. Quote above, is this coil laying on its side? I have no personal experience, but this seems to come up all the time in these forums. The oil filled ones don't like being set up horizontal. You could test for spark when you're having the no start condition. Seems a lot of guys either fab up a way for it to sit vertical or go with an epoxy filled one. Also, I'm assuming the starter is still cranking fine when you get the no-start? If not, this would be something else. |
03geetee wrote:Posted By: horkn
Date Posted: June-15-2011 at 3:08am
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As Brian mentioned, oil filled coils don’t like to lay on their side. Mr gasket sells one through summit or other places for around six dollars. I put one of those chrome plated mr gasket ones on this spring.
Yes, there are several epoxy filled canister coils. Just don't run an Accel brand. Those are junk and notoriously known to failmore often than pretty much every other name brand. This issue seems to come up a lot. ------------- 78 martinique- refloored, reinforced, stringers re glassed, re engineered interior GT40P heads Edelbrock Performer intake acme 4 blade http://img.photobucket.com/albums/v64/horkn/fish/nautique.jpg |