Question about GMC Sierra
I personaly dont see many water pump gaskets leak, but instead there is a weep hole that they leak from when they wear out. they are designed this way. which is common. reason it may leak with ignition off is now the pressure builds up verses being cycled through the engine and doesnt reall have time to squirt out.and it just finds a way out with engine off which would be your weep hole most likely.
Its not hard to fix or replace water pumps on the gas engines. there should be the large A/C and powersteering bracket that can be removed and sometimes if you dont have clearence the alternater bracket. its not very hard. basic tools work just fine. the only thing that may be alittle hard is the fan nut. you will need a large wrench and something to stop the pully from spining while loosening and tightening that nut. should take about 2 hours or so. IIRC13mmm, 15mm bolts, 9/16 bolts and 10mm and 8mm bolts. that all you need.other than the large wrench. pipe wrench will work but you need something to prevent the pulley from movning. thats very important.
Good luck. I hope i answered your question.
Posted on Apr 29, 2009
have it tested using a manual gage if still low then main baring ore most likely bad that would mean a over hall if is really low and bearings bad should be making rattle noise when started up first few seconds
Posted on Mar 11, 2010
Testimonial: "thanks alot.truck is not making a rattling noise.we did check it with a manual gauge.it read about 10 at idol. press. gets better as you incr speed"
Sounds like an oil pressure problem. The clacking sound is most likely the lifters are collapsing due to loss of oil pressure. You may have a failing oil pump.
Posted on May 08, 2010
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