Next week my 91 suburban will be going to the mechanic to change the
intake manifold gasket. Is there anything else they should be when they
have the engine open??? I was going to have them check the stretch of the
timing chain, wear on the distributor, relash the valves, change the
thermostat and housing gasket and new TBI gasket (since the fuel lines are
disconnected). The engine has 150k on it and I want it to last another
100k. The engine does not burn a drop of oil and still runs as it did when
it was new. Thanks for the suggestions...
Valves are hydraulic so they do not need to be relashed. TBI gasket is a
good idea and maybe Tstat too. To visually inspect chain requires
additional tear down and if you do, you should change the chain while it
is apart. Do not use GM gaskets, use FelPro
Have them replace the valve cover gaskets. Instruct them to NOT use the
rubber or cork at the manifold ends. Have them use a 1/4 inch bead of
high-quality silicone. With 150,000 miles, a new water pump, roller timing
set, and thermostat are a must. Have them use fel-pro gaskets everywhere.
Since the pan will be loose to do the timing cover, also have them replace
the pan gasket and rear seal.
Everything is under the assumption that you are willing to pay a good
chunk of change to have it done. It is entirely up to you
that rear seal is a one piece. That may run into some major cash at the
shop. Engine or tranny has to be moved back to replace it.One piece rear was
a MAJOR improvement but with 150K you probably have wear on the crank at the
seal surface, kinda like the wear at the harmonic balancer seal surface. Not
sure if they make a sleeve or if the crank seal surface will need to be
turned. Might want to leave it alone if its not leaking. Just my opionion.
"Shades" <shades_1970(at)netins(dot)net> wrote in message
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