| Re: [GMCnet] Noisy Lifter [message #107765] |
Tue, 07 December 2010 05:24  |
Gary Casey
Messages: 448
Registered: September 2009
Karma: 0
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If it really does go away after a little while ( 5 seconds? 30 seconds?) after
starting, I would just write it off as an annoyance and try to forget about it
as being one of those things that's not worth fixing. 35 year old machines have
those sometimes, just like 70 year old people (there's this slight pain in my
knee....).
Gary Casey
Mr.RadioActive wrote on Mon, 06 December 2010 18:49
> Again, I'm not even remotely wanting to try to get it warrantied. Even if not
>through them. I trust like zero mechanics at the moment. If I lived abit closer
>to JimK I'd love for him to go through that and my fuel system.
> Im fairly sure its a lifter, one of my employees today was saying it has to be
>since after start up the noise does tend to go away.
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| Re: [GMCnet] Noisy Lifter [message #107782 is a reply to message #107765] |
Tue, 07 December 2010 09:29  |
RadioActiveGMC
Messages: 1020
Registered: November 2010
Location: Hot AZ desert
Karma: 0
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Senior Member |
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No it goes away, but not in 30 seconds. I'll have to gather more info. Sometimes I dont hear it at all. It does go away, but I think if Im correct after a few mins when it does happen.
***"Gettin There"-1973 23' Sequoia-
Michael, Onans smell, "Go solar/wind power!"
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| Re: [GMCnet] Noisy Lifter [message #107822 is a reply to message #107782] |
Tue, 07 December 2010 13:40 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| Mr.RadioActive wrote on Tue, 07 December 2010 10:29 |
No it goes away, but not in 30 seconds. I'll have to gather more info. Sometimes I dont hear it at all. It does go away, but I think if Im correct after a few mins when it does happen.
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Radio,
If it does not always evidence itself, then it is probably a lifter (hydraulic lash adjuster).
If it really takes a couple of minutes to pump up when it does get bled down, that is one seriously sick lash adjuster or you have very poor lube oil flow to that part of the gallery.
It is intermittent because the lash adjuster only bleeds down when it is off the base circle of the cam and that base circle is 3/4 of the cam.
As long as you don't load the engine before the valves get quiet, you will not do much harm.
By the by, your chances of locating the bad lifter are about squat. I know, I tried on a couple of occasions. The best way is to cold start the engine with the cylinder head covers removed. If you hear it, feel all the rockers and one will have a snap in its motion. If you don't hear it or feel it, shut down and try again in 8~12 hours (really).
Good Luck
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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