valves - Diesel Truck Forum -
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post #1 of 4 (permalink) Old 01-31-2010, 08:44 PM Thread Starter
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Can anyone explain how to adjust the valves on my truck. It has 247000 miles on it and I am told that it should be done and is possibly a power loss
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post #2 of 4 (permalink) Old 01-31-2010, 10:28 PM
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On the ISB engine,remove the cap in the frt cover in frt of the fuel pump.remove the rocker cover bolts.The rear bolt will not come out.It will be left in the rocker cover for removal & installation.There is the a TDC mark on the frt cover & a line on the fuel pump gear.turn the line either at 12 oclock or 6 oclock position.Intake vavles are 0.010 & Ex valves are 0.020.You will need a 9/16 or 14 MM wrench for lock nut & 5 MM allen for screws.When at 12 oclock adjust exhaust vavles on 1,3,&5 cyl.Intake on 1,2,74.Turn line to 6 OCLOCK & adjust exhaust on 2,4,& 6 cyl.Adjust intake vavles on 3,5,& 6.

Thats outta the Haynes Manny


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post #3 of 4 (permalink) Old 02-01-2010, 06:09 AM
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All I would add is to turn it with a turning tool or slowly off the damper mount bolts you do not want to over-tighten the injection pump gear retainer nut. Intake is 1, 2, and 4

1988 ford van fresh overhaul, 1991 nissan pick-up 1993 Caprice 2000 GMC S10 Blaser 2007 nbs 3500 GMC 4x4 crew-cab long box 17 inch single wheels Duramax Alison. BW turnover Ball. Furakawa FL35 loader. Retired, HD mechanic, worked on engines all my life. Fabricator welder. electrician. in the process of finishing my new shop. Live in Rock Creek B.C. Wife has a fruit stand.
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post #4 of 4 (permalink) Old 02-01-2010, 05:31 PM Thread Starter
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Thanks. I am going to give this a go tonight.
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