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post #1 of 3 Old 10-10-2001, 05:25 PM Thread Starter
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Join Date: Oct 2001
Location: charlotte, nc
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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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post #2 of 3 Old 10-10-2001, 11:27 PM
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1994 YJ Wrangler 
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Location: Oceanside, CA, USA
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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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post #3 of 3 Old 10-11-2001, 05:42 PM Thread Starter
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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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