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Old 02-14-2013, 01:00 PM
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Valve seals 88 s-10 4.3 liter!

I replaced the head gaskets on my stepsons 1988 s-10 4.3 liter! Well the gasket kit only came with enough umbrella valve stem seals for the compression stroke valves! Do you not use anything on the exhaust stroke valve stems! Also book says to snug up until you cant turn lifter rod, then tighten three quarters turn! Seems way to tight to me?

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Old 02-14-2013, 01:10 PM
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i always snug them untill the push rod does not chatter up and down. then when the engine is running you tighten untill the chattering sound goes away then add a light half turn. thats how i always did it. works well. if im breaking in a camshaft then i take up the valve train slack and go 3/4ths turn on the setup so i can fire up running so as to break in the camshaft properly. however after 30 mins i would readjust the rockers with a warm engine idling after the cam is broken in. always use new rocker ball nutz. the old ones are junk unless you smack em with a hammer on the floor, i dont recomend that though. new ones are cheap.
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Old 02-14-2013, 04:28 PM
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Quote:
Originally Posted by KennyPro View Post
I replaced the head gaskets on my stepsons 1988 s-10 4.3 liter! Well the gasket kit only came with enough umbrella valve stem seals for the compression stroke valves! Do you not use anything on the exhaust stroke valve stems! Also book says to snug up until you cant turn lifter rod, then tighten three quarters turn! Seems way to tight to me?
The umbrella seals are for the exhaust valve. The intakes take a positive seal. Blue colored in Fel-Pro sets. Black in most others. Three quarters turn is alright. Thre is usually more than 1/4" adjustment travel in a lifter
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Old 02-14-2013, 06:50 PM
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In order to set the pre-load of hydraulic lifters you must know the plunger travel. The various GM hydraulic roller lifters have two different plunger travels, .120", .166" and .237". The latter was for the VIN W engines with a small base circle camshaft and it has has been discontinued. This is why noisy lifters are the result when incorrect pre-load is used.

The 1988-1991, 4.3L V6, VIN Z engines came equipped with AC Delco HL-112 (GM-5234890) hydraulic roller lifters. Stock GM lifters for that engine have .120" total travel and the lifter pre-load should be set at half travel or .060" or the pre-load will require continued readjustment. . That pre-load is approximately 3/4 turn from zero pre-load. One turn = .041" with 24 tpi rocker arm stud thread pitch, 1 turn / 24 tpi = .041". The 1.5 rocker ratio increases the depth by 66%. (.041" x 1.66 = .068").

Find the actual depth per turn including the rocker ratio:
D = Pre-load depth in inches
F = Distance with 24 tpi
A = 1 turn
B = rocker ratio

D = F x (A+B ) / B

.041" x (1 + 1.5) / 1.5
.041" x 2.5 / 1.5
.041" x 1.66
D = .068"
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Old 02-15-2013, 01:14 AM
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Originally Posted by BOBCRMAN@aol.com View Post
The umbrella seals are for the exhaust valve. The intakes take a positive seal. Blue colored in Fel-Pro sets. Black in most others. Three quarters turn is alright. Thre is usually more than 1/4" adjustment travel in a lifter
I got the blue ones on the compression valves, but felpro kit did not have any umbrellas in it! What about the o-rings? Thanks for the info, very helpful! Im no mechanic! Im a Plumber with very little mechanical know how!
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Old 02-15-2013, 07:58 AM
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O-rings are used only if valve has two grooves. Installed in lower groove. The correct exhaust seal is a white/clear umbrella.
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