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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Oct 2011 Posts: 89 Shop Shark | | Shop Shark Joined: Oct 2011 Posts: 89 | after putting a new rear main seal in we are yet to find a toque rating/specification for the crankshaft caps. is there a certain amount of torque needed or do you just use a little muscle to get them nice and snug? | | | | | Joined: Jan 2015 Posts: 914 'Bolter | | 'Bolter Joined: Jan 2015 Posts: 914 | No muscle unless applied to a torque wrench.
Try GM Heritage and the Old car manual project. Two great websites.
Where in the empire state are you? Jeffrey | | | | | Joined: Oct 2011 Posts: 89 Shop Shark | | Shop Shark Joined: Oct 2011 Posts: 89 | queens, they were on tight enough where we had to use a breaker bar to get them to break lose but we don't know the torque rating is there one | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | What year and type engine are you working with? There is a spec, but it is different depending on what engine you're working with.
Bill Burmeister
| | | | | Joined: Oct 2011 Posts: 89 Shop Shark | | Shop Shark Joined: Oct 2011 Posts: 89 | | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 |
Bill Burmeister
| | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | As Bill posted, Adjust Main Bearing, Step 3. To other members: if modern precision bearings are used in a 1954 235/261 block, is plastigauge measurement/adjustment necessary? That procedure is still shown in the 1955-2nd series Truck Shop Manual. However, the 1956 Truck Shop Manual states that shim adjustment is no longer necessary (due to the introduction of precision bearings?). | | | | | Joined: Jan 2013 Posts: 1,384 Shop Shark | | Shop Shark Joined: Jan 2013 Posts: 1,384 | A plastigauge check is always advisable with a used engine. You never know which of the many possible things a PO has screwed up.
I usually put one strip each of red and green on the mains, assembled dry, and torque them all down. Then remove them, confirm the spacing is correct,lube everything up with STP and do the final torque.
I have found a few supprises over the years.
Last edited by Jim Sears; 11/07/2016 5:16 PM.
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