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Unread 10-10-2001, 06:25 PM   #1
rustyjeep
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Join Date: Oct 2001
Location: charlotte, nc
Posts: 2
engine

1980 cj7 with 151 c.i. 4 cyl (gm motor). Rebuilt but I cannot find specs for valve adjustments. Hayes manual no help.

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Unread 10-11-2001, 12:27 AM   #2
Nightclaw
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1994 YJ Wrangler 
 
Join Date: Jul 2001
Location: Oceanside, CA, USA
Posts: 150
Er... The GM 151cid/2.5L (Pontiac's "Iron Duke") used hydraulic lifters. There should be no valve adjustment. If you're getting excessive valvetrain noise, you probably have a collapsed lifter or blocked oil channel somewhere.

On the off (and somewhat improbable) chance that you have mechanical lifters/solid camshaft, Crane lists three lash adjustments for solid and roller camshafts in the Iron Duke:

Mechanical Lifters, 112 LSA Cam: .028" Intake / .030" Exhaust
Mechanical Lifters, 106 LSA Cam: .020" Intake / .020" Exhaust
Roller Camshaft/Lifters: .035" Intake / .030" Exhaust

Source: http://www.cranecams.com/master/apps/pontiac1.htm
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Unread 10-11-2001, 06:42 PM   #3
rustyjeep
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Join Date: Oct 2001
Location: charlotte, nc
Posts: 2
10-4, they are hydraulic. The nut screws on the stud and compresses the lifter. I am assuming that there is 0 clearance. But, there is no lock nut or keeper and I think that they should be torqued at 4-10 ft lbs at TDC for each cylinder but I can't find any thing on it. Also, what locks the nut?
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