atb

See, this is why Jim is such an effin' stud compared to the rest of you cream puffs. Details, details, details. Thank you Jim!

Colin and Abby, go back and read the instructions - quantity, time, and miles please.

atb

I agree with you Dan, it sound like something breakable is about to break.

Rob Edwards

Having had apart a couple of lifters, I can't say that I know exactly where the noise would be coming from, but if lots of detergent in the oil fixes them, presumably the lifter is either collapsed due to crap blocking the inlet, in which case the lifter is being ping-ponged between the cam nose and the valve stem face. Or the lifter is pumped up from crap blocking the outlet, so the lifter is now 'solid', and the valve is getting opened further (risking a bent valve at high rpm) or not closing completely, which kills compression, and eventually burns the valve.

I don't see how either scenario can be a good thing, over long periods of time.

Lizard928

I put in the ATF about 500 km before the change and try to get the oil up to as high a temp as possible.

Does that help?

kevinlieb

Stupid question: ATF in the gas or oil, and how much?
The idea scares me...

AO

Whoa! Bad flashback!

Yeah, I was scared ****less on that. I thought for sure something was going to break. but it didn't. It took a good half an hour before the lifters pumped up and things quieted down. Remember, the temp is only of the coolant, not the oil. It takes at least 30 minutes for the oil to get hot. You need the oil to get good and hot for it to thin out enough to pump up those lifters. Drive it more... maybe try some ATF (in the oil) to see if that helps.

GregBBRD

The problem is dirt/varnish on the check ball for the hydraulic lifter....although it does concern me that your lifters made more noise after a few minutes. That usually means that oil isn't getting there, properly. Cam carrier gaskets installed correctly? Head gaskets installed on the wrong side?

Having "fought" lifter noise....both in 928s and 944 engines....and having tried almost everything....Swebco 502 is the stuff. You can have an engine that is sitting there, clattering away, pour Swebco in and within minutes, the lifters will be quiet. Virtually the only oil additive I use....and only when there is lifter problems.

If you pour in a bottle of Swebco and the lifter noise isn't gone/greatly inproved in a matter of minutes....you need to figure out what the oil supply problem is.

hacker-pschorr

This stuff?

http://www.swepcolube.com/products/s...e-oil-improver

GregBBRD

That's it.

Back when we did lots of 944s, we would have a car come in with lifter noise....slowly add a bottle of that stuff (while the engine was running and the oil was hot)....and the noise would be gone, before the entire bottle got into the crankcase.

Did this several times...not just once. Amazing stuff.

To give you an idea of how good it works....I've never had to replace a single noisy lifter....none. And you've got have some idea of how many noisy lifters I've seen, in the 35 years that I've been working on these cars with hydraulic lifters.

This stuff loosens up so much crap and varnish, that they suggest you change the oil, on "dirty" engines very soon after using it.

Literally, if this doesn't "fix" the noise almost immediately, I'd be trying to figure out what the "real" problem is.

Abby Normal

I did it on a fresh motor after the second oil drain at about 1000 miles. I did it since the lifters were noisy at idle even after the engine was good and warm. Not always but it would tap like hell sometimes at idle even after cruising around. I put the small can of Rislone (not sure how much that is but I guess a pint) and then ran the engine. It instantly got rid of the noise and has not ever been noisy again.


Since GregB posted the Swepco though, I would go with that now I know it is out there. Swepco is quality stuff!

S4ordie

I think Swebco 502 and Mobil One use the same secret sauce; Molybdenum Disulfide.

GregBBRD

Yes, has quite a bit of moly in it....it is black with the stuff....but the solvents are what clean the lifters.

SeanR

Hmmm, guess I'll be switching.

Now to find a dealer.

danglerb

I suspect this mode is unlikely as the low part of the cam defines the max expansion of the lifter vs the valve spring, no forces come to mind that would expand the lifter working against the valve spring force.

5 to 10 min most recently using MMO on a 6 month since last start, and I recall it was half and hour or more on my old Euro motor first time I started it.

How important is the oil change soon part? Swebco vs Marvel Mystery?

kevinlieb

Seems like Pelican sells the Swebco 502