351 fat idle
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=31862
Printed Date: October-08-2024 at 5:16pm
Topic: 351 fat idle
Posted By: captbob626
Subject: 351 fat idle
Date Posted: October-22-2013 at 9:51pm
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I have a 351 commander in my sn. I cannot get the idle below 800- 1100. Irradic idle. Carburetor drips after I shut it off out of throttle plate. I cleaned the needle valves but still irradic idle. Any suggestions. One guy said could be getting air through a intake leak. ------------- Bob Meimbresse |
Replies:
Posted By: SNobsessed
Date Posted: October-22-2013 at 10:52pm
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One way to find intake leak is to spray carb cleaner around suspect areas. If you hit the leak the idle will smooth out temporarily. ------------- “Beer is proof that God loves us and wants us to be happy.” Ben Franklin |
Posted By: backfoot100
Date Posted: October-23-2013 at 11:34am
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If it's dripping fuel after shut off and you cleaned the needle/seat already, your float is set too high. Lower it until it stops dripping after shut off. Either that, or you still have crud in the fuel bowl that cruds up the needle/seat right away. ------------- When people run down to the lake to see what's making that noise, you've succeeded. Eddie |
Posted By: captbob626
Date Posted: October-23-2013 at 4:30pm
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Thanks gang, I'll check it out. ------------- Bob Meimbresse |
Posted By: captbob626
Date Posted: November-01-2013 at 8:13pm
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Got carb shop to rebuild carb ( 4160 Holley). Runs better, no loping just won,tho below 750 rpm. Any suggestions? ------------- Bob Meimbresse |
Posted By: captbob626
Date Posted: November-01-2013 at 8:15pm
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Sorry about the spelling. Just won't idle below 750 rpm. Should idle at 650 I believe. Any suggestions? Thank you ------------- Bob Meimbresse |
Posted By: phatsat67
Date Posted: November-01-2013 at 10:15pm
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Bob, so you can screw the idle adjustment screw all the way out and it won't go down anymore? You either have a vacuum leak or the timing is too advanced initial to let the engine idle down anymore. Check the timing and check for leaks. Suspect areas are around the base of the carburetor/pcv valve/ worst case intake manifold gaskets. Check those areas and the timing and report back. ------------- |
Posted By: captbob626
Date Posted: November-01-2013 at 10:23pm
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Hey Zack, I will do, alo read the post Art I'd Sept 13, this may be an auto carb. It was on there when I got it? I'll chek on tues when I pick the boat up. ------------- Bob Meimbresse |
Posted By: phatsat67
Date Posted: November-01-2013 at 10:27pm
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Post up some pics and the list number on the carb. ------------- |
Posted By: captbob626
Date Posted: November-01-2013 at 10:30pm
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I will do that when I pick it up on tues evening ------------- Bob Meimbresse |
Posted By: captbob626
Date Posted: November-06-2013 at 11:59pm
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Well, First of all a thank you to those of you that chimed in with suggestions. I had the carburetor rebuilt, that took care of the dripping problem but could not get an idle below 800 rpm. Checked for intake leaks could not find any. Checked points, They were set at .010. I reset to .015. Then checked the timing. Timing was 11 degrees ATDC. Should be 6 BTDC. Idle dropped to 450 rpm. Then reset to idle at 650 rpm and seems to be very smooth and starts easily. Thanks again for all your input. Carb was a marine carb. Thanks for the photo's Art. Bob ------------- Bob Meimbresse |
Posted By: 89Martinique
Date Posted: November-07-2013 at 1:31am
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wow 11 ATDC! You should notice a good performance increase! I noticed a big one when my CC was running 1 ATDC vs the 10~12 BTDC. (PO really scratched up the timing wheel. its close enough) glad you got it fixed, bummer summer is over... ------------- Current Boats: 1992 Supra Comp-TS6M PCM 351w HO Pro Boss Pro-Tec Ignition - Full Composite (no wood stingers!) 1989 (3rd Gen) Correct Craft Martinique B/R PCM 351w Power Plus 1984 E-Scow Keuka Lake, |
Posted By: phatsat67
Date Posted: November-07-2013 at 10:27am
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Did you get to put it on the water again Bob? ------------- |
Posted By: captbob626
Date Posted: November-07-2013 at 8:24pm
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Not yet zack. We are fishing everyday until after the new year. Hopefully in the spring ------------- Bob Meimbresse |
Posted By: phatsat67
Date Posted: November-08-2013 at 10:36am
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Busy guy with a big boat!! ------------- |
Posted By: KRoundy
Date Posted: November-08-2013 at 12:40pm
This thread right here is a perfect example of how awesome is the CCF family. Now - we would LOVE a video post of that nice smooth idle for all to hear.  ------------- Previous: 1993 Electric Blue/Charcoal Ski Nautique Current: 2016 Ski Nautique 200 Open Bow |
Posted By: captbob626
Date Posted: November-08-2013 at 5:43pm
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How do I do that? I havean iPhone Dante video, not sure how to post. ------------- Bob Meimbresse |
Posted By: phatsat67
Date Posted: November-08-2013 at 6:15pm
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Probably have to go through youtube Bob. ------------- |