crank shaft seal replacement on 2000 Chevrolet Astro

rear seal is leaking

by in Granite Bay, CA on September 23, 2013
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3 answers
ANSWER by , September 24, 2013
If not done already, remove the engine cover and make SURE it's not the oil sending unit or the distributor o-ring seal that's leaking!! Either of these can leak oil down the rear of the engine and appear to be coming from the rear crankshaft seal. This 4.3 engine has a very reliable, one piece, round crankshaft seal, which requires transmission removal to access. "IF" it is indeed this seal!!! More common for oil to leak elsewhere however rear seal is possible..
ANSWER by , September 23, 2013
you will have take the tranny out to change the crank seal,if it is the rear main seal then you will have to drop the oil pan providing its a two piece seal
ANSWER by , September 24, 2013
agree with good guy or ck