To Kick It All Off...Engine Knock's!

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Mtn-Track
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To Kick It All Off...Engine Knock's!

Post by Mtn-Track » Fri Feb 24, 2006 2:52 pm

When my 'A5 sits for more than a month, the engine knocks. It takes about 20 minutes of run time, shut it off for another 20 minutes, then start it back up to get it to go away.

I have checked the plugs, oil level, oil metalics, rockers, push rods, etc, and can't seem to find anything strange. My guess is a bad lifter? Never torn it down that far. Any ideas would be appreciated.

I do have a new engine to put in it just in case, but would rather run this one out first, but not explode it.

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Post by Chuck W. » Sat Feb 25, 2006 11:38 am

Next time you change oil, add a few glugs of Marvel Mystery Oil. Mine did the same thing and the MMO stopped the lifter noise.
North Alabama

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Post by gbooth » Sat Feb 25, 2006 1:33 pm

Mine does the same thing after sitting for a long period of tine we are talking weeks the Lifters knock bad but quiets down after 10 minuets or so. The Marvel mystery oil will help.
Greg Booth
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Post by edisworking » Sun Feb 26, 2006 6:55 am

I thank you are are right about a lifter, I had one that made noise. I flushed the motor with K-1 , & filled it w/ mobil 1 oil no more noise

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Post by Mtn-Track » Mon Feb 27, 2006 10:46 am

Thank's for the help guy's! I'll give the MMO a try and see if that helps.


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Post by ramack153 » Wed Mar 01, 2006 6:38 am

Is it a click or a louder knock? If it's a knock, it's crank/rod related. Clicks are lifters.

Rich
4/60 M274, soon to be an A3

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Post by Mtn-Track » Wed Mar 01, 2006 8:14 am

Hi Rich,

It is definately a KNOCK, not a click.

I sounds exactly like a rod bearing to me, but it does go away and there are no metalics in the oil. It may be an exhaust lifer that's causing compression hammering. If it didn't go away, I'd swear that it was about to launch a rod or break the crank.

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Post by ramack153 » Wed Mar 01, 2006 9:55 am

I would try to tap into the oil line and measure the pressure. Maybe the relief valve is sticking until warm.

I wouldn't run it any more until you measure the pressure. I'm now in the process of doing a 4=>2 cyl conversion because I think I lost pressure and spun a brg. I toasted the crank and it is now more expensive to rebuild the 4 cyl than to do the conversion.

Rich
4/60 M274, soon to be an A3

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Post by Mtn-Track » Thu Mar 02, 2006 9:53 am

Rich, you may be right.

I will put some MMO in the engine tonight and see what that does. If that doesn't make the knock completely go away, I think I will pull the engine for an overhaul. I have no idea how many hours are on it and I really don't want to smoke it.

My new replacement engine has the alternator, oil pressure gauge, electric starter, etc. and ready to put in. During the overhaul of the T/O I can set it up for the same upgrades.

Thank's again!

Stu

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