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Unread 10-10-2001, 05:25 PM   #1
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Join Date: Oct 2001
Location: charlotte, nc
Posts: 2

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 10-10-2001, 11:27 PM   #2
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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
[b]'94 YJ Sahara Hardtop[/b]
4.0L / AX-15 / Stock NP231 / Stock D30 (open) / D60 (35-spline, Detroit locker, Moser axles) / rear disc brakes / 4.56 gears / Advanced Adapters SYE & CV Shaft / 33" BFG MT-KM's / Thorley Header / Magnaflow Muffler / BesTop Flares
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Unread 10-11-2001, 05:42 PM   #3
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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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