i have a 1991 s10 pickup with a 4.3l v6 that has developed a lifter noise. i am pretty certain thats what the noise is. i need to know if i can adjust the valve lash on this and what the specs are. i have no experience with this particular motor but have quite a bit with older gm v-8 engines. any help would be greatly appreciated

 

if you know anything about the sbv8 then you can aply it to the 4.3 cuse all it is is a v8 wit 2 cylenders cut off. the hynes manual shoult have all the specs on valve lash that u need.

 

yes they are ajustable , i have same 4.3L Z 91 S10 , i did mine when i replaced valve seals , i got them too tight and it would not start , good thing it didn't i would have bent a push rod , a freind of mine loosend them and had me start it , he adjusted them by sound and feel , oil ALL over the place but they got adjusted!!!! i used a feeler guage and thought i followed the proper order but i screwed up ......good luck

 

i think if i remeber corectly the last time i did it i was told that if u ajust them till u cant move them any then back off 1 half turn they should be very close to the right spot.

 

sorry i forgot to say also that the motor has to be at tdc when u start.

 

thanks, ihave removed the valve cover and the rocker is very loose at tdc. anybody know if it has solid or hydraulic lifters? the nut on the rocker does not appear to have backed off at all. also, if it is hydraulic, is it possible to tell if the lifter is bad without removing the intake manifold? thanks

 

i am sure that you would have to take the intake off becaure the liffters are so far down. i am not sure if they are solid or hydraulic liffters. also i got one thing wrong in the other post. it is to titen them till they dont move then titen them 1 full turn not lossen sorry.