87 Chevy S-10 truck 2.8

Tiny
RLH
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  • 1987 CHEVROLET TRUCK
Just replaced the intake manifold gaskets due to a major leak in the rear. Had to remove push rods. After getting it all back together, when it turns over it's like there is no compression, do the rockers have to be adjusted and tightened separately? Seems someone told that once but ive never done this on this truck before.

what else could the problem be?

ps-torqued the rockers to 23ft/lb
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Sunday, February 25th, 2007 AT 10:24 AM

9 Replies

Tiny
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Some of those engine had oversize and regular lifter, were you sure to replace pushrods and lifters back in their original location? And is the timing correct?
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Sunday, February 25th, 2007 AT 1:16 PM
Tiny
RLH
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I never removed the rockers, just loosened them and moved them aside. I took out the push rods, and maked them for position and yes they all went to original positions. I had just have the truck smogged so the the timing was correct, I put the distributor back to where I took it out of. Thing is, I may have overtightend the rockers, because the lash was gone long before I finished tightening the rockers. I thought is should try loosening the rockers, then tightening just until the lash is gone then add 1/2 turn.
Any comments welcome
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Sunday, February 25th, 2007 AT 7:33 PM
Tiny
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As far as I know and I checked on gm soft ware the lash is checked by hand whike soinning the push rods, when they get tight stop, run the vehicle and recheck
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Sunday, February 25th, 2007 AT 7:47 PM
Tiny
RLH
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That sounds right
do they have to be adjusted in any specific order
ie- intake 1, 3, 5
exhaust2, 4, 6 ?
Some ive worked on(it's been a while) were tricky like that
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Sunday, February 25th, 2007 AT 10:10 PM
Tiny
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The info is so old it doesnt say but I would guess it would be done with the valves closed one cyl at a time

thanks jim

oh and leave some feedback if you were happy with your help, we all donate our time here helping others free of charge
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Sunday, February 25th, 2007 AT 10:15 PM
Tiny
RLH
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Hey jim you have been a great help, since its dark and cold where Im at the repair will start in the AM.
I was a auto tech for nine years, been out for about 6, and I like the fact that there is a place for us to go to get help. I really appreciate the quick response time, that's usually unheard of

i"ll let you know how it goes tomarrow.

Thanks Ron, from central california
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Sunday, February 25th, 2007 AT 10:28 PM
Tiny
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Yes do theat, lets us know

jim

oh and leave some feedback if you were happy with your help, we all donate our time here helping others free of charge
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Monday, February 26th, 2007 AT 8:11 AM
Tiny
RLH
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Hey jim when are the valves considered closed?
Push rod end up or push rod end down?
I got a manual, and it says the valves must be adjusted 1, 5, 6 and 2, 3, 4 but in the no 1 position
with valves closed. Moving the crank shaft to the timing scale on -0- you are either in NO1 or NO4 position, no problem, just need to know when they arew visibly closed, and the lash I will just adhust by feel of the rod, I will adjust rockers just until there is no movement, does that sound correct?

Thanks Ron
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Monday, February 26th, 2007 AT 12:50 PM
Tiny
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Yes it sounds close, and the #1 tdc should have both rockers up
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Monday, February 26th, 2007 AT 1:22 PM

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