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| | | | Joined: Jun 2012 Posts: 44 New Guy | | New Guy Joined: Jun 2012 Posts: 44 | I have looked and searched and can find chevy adjustments but none on gmc. My son's is '53 gmc 228 and could anyone supply us with the correct procedure. Is it done with engine hot or cold? Thank you | | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy jdzcno, both Chev and GMC sixes have the same firing order, so what would work on a Chev engine will work on a GMC engine, hope that helps. | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | | | | | | Joined: Mar 2011 Posts: 940 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 940 | I believe valve adjustments in general are usually, if not always, done hot.
oldgmctrucks.com is a great resource for ya. | | | | | Joined: Apr 2005 Posts: 1,107 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 1,107 | I believe valve adjustments in general are usually, if not always, done hot.
oldgmctrucks.com is a great resource for ya. i take mine for a ride before i do them because where i live by the time i get home the engine is good and hot. i have everything ready so when i get home and do it as soon as i shut it down before it has time to cool down. oldgmctrucks has a easy tried and true method. | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Final valve adjustment settings are always done on fully warmed-up engines. Shop/Maintenance manuals always stress this (run for 30 minutes before setting valve lash).
Another factor that affects valve lash adjustments on old engines is that the valve-to-tappet (rocker arm) contact point can become quite warn and a groove gets warn into the contact face on the tappet. A good adjustment is impossible unless that contract surface is smooth (a jack-leg work-around was to use thin feeler gauges - ugh). This concern is described in some of the valve lash setting tech tips.
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