PCV Valve Grommet & vacuum gauge attachment
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=47668
Printed Date: May-07-2024 at 1:47pm
Topic: PCV Valve Grommet & vacuum gauge attachment
Posted By: andrewmarani
Subject: PCV Valve Grommet & vacuum gauge attachment
Date Posted: July-01-2019 at 4:45pm
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After I had the Holley carburetor rebuilt this spring I've been having idle stalling issues and have been reading the forum and working my way through the solutions. At this point the engine is running fairly well but still has some surging and I can't get the idle down below 900 or 1000. I've checked and don't have any vacuum leaks around the carburetor, but didn't know at the time to check around the PCV valve and connection at the valve cover. The PCV grommet looks like it has a crack in it and the PCV valve and the grommet are original to the boat. Neither are expensive so I am going to change them out along with the hose. I cannot find anything online giving me a grommet specific to this engine. Anyone know the model number or ID and OD of the grommet? Along the way I would like to install a T and a connection for a vacuum gauge in the PCV hose. Once I am sure i've eliminated any possible vacuum leaks I am going to properly adjust the idle screws with a vacuum gauge. Any suggestions on parts for a neat installation of a vacuum port would be appreciated. 1986 Silver Nautique. Ford 351. Picture shows the top of the engine but was taken in 2008, so various hoses and electrical items have been upgraded since then. Thanks Andrew  ------------- Builder |
Replies:
Posted By: GottaSki
Date Posted: July-01-2019 at 5:32pm
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Did you remove the throttle cable to verify the throttle is actually returning to its adjustable stop? ------------- "There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing." River Rat to Mole |
Posted By: andrewmarani
Date Posted: July-01-2019 at 5:48pm
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I didn't. However as I turn the curb screw out the RPMs drop and engine starts to stumble around 800 +/- and then dies. ------------- Builder |
Posted By: Jonny Quest
Date Posted: July-02-2019 at 1:30am
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Based on your symptoms, your idle circuit may need to be tweaked in addition to correcting any vacuum leaks. Watch the video in the link below to see how to adjust the idle circuit on a Holley 4160 carb. https://www.youtube.com/watch?v=xf54Pg9S5ZA" rel="nofollow - VIDEO LINK JQ ------------- Current 2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
Posted By: KENO
Date Posted: July-02-2019 at 9:20am
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Here are a couple of pictures of what works for me. The Tee came in an assortment of fittings from one of Pete's favorite places like Auto Zone or Advance Auto. it was a Dorman package with a variety of fittings. I suppose Pete's NAPA would have them too  You can leave it in the hose and cap it or remove when done. I take it back out and hook the long hose back to the PCV valve Some people just unhook the hose from the PCV and plug the vacuum gauge into the hose, either way will work
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KENO wrote:
