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Noisy hydraulic lifters

Posted: Sun Mar 21, 2021 7:57 am
by Don Smith
Hi guys and gals: Is it better to let my 928 idle, while the oil pressure is building up, after sitting all winter, or after 1 or 2 mins, should I just hop in the car, and drive it slowly, till the noise disappears?
Thanks.
1988, roughly 160,000 miles.

Re: Noisy hydraulic lifters

Posted: Sun Mar 21, 2021 9:22 am
by SeanR
Start it up, go for a drive. I'd not smash the throttle to the floor, just be easy on it.

Re: Noisy hydraulic lifters

Posted: Sun Mar 21, 2021 10:25 am
by worf
Yeah, not a good idea to just idle with clackity lifters.

For 928s that sit over-winter, I always get the oil pressure 'started':

- unlatch EZK, LH
- run starter for 5-ish second interval, rest ~30 seconds
- lather rinse repeat until I see the oil pressure needle move
- re-latch EZK, LH

I have seen 928s that, after long storage periods, will idle for 2, 3, 4 seconds before the oil pressure needle moves. That's bad juju for main and rod bearings in the long term. It's easier with plugs out, but no matter what, a starter is easier to replace than bearings.

If you run your 928 every week you'll not have start-up oil pressure delay. But, after a month or so, you loose enough oil film in the 'guts of the engine' so that the pump has to 'suck' for a couple of seconds.

Re: Noisy hydraulic lifters

Posted: Sun Mar 21, 2021 10:29 am
by Don Smith
Thank you, gents. Hell, I should just have Luc do this, before I pick up the car....

Re: Noisy hydraulic lifters

Posted: Sun Mar 21, 2021 3:15 pm
by Schocki
Our GT doesn't respond well to idling just to warm up the engine. If you fire it up, drive it too....

Re: Noisy hydraulic lifters

Posted: Sun Mar 21, 2021 5:15 pm
by oups59
Don Smith wrote: Sun Mar 21, 2021 10:29 am Thank you, gents. Hell, I should just have Luc do this, before I pick up the car....
I have a better solution, I will take the car out for a drive :burnout:

Re: Noisy hydraulic lifters

Posted: Sun Mar 21, 2021 8:44 pm
by Don Smith
Just wash it when you finish.....