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augidog · Joined: 03 Mar 2003 Posts: 1360 Location: New Jersey

Rod bearing replacement was a piece of cake not counting the whole" Pan Removal Trip to Hell and Back" deal.
Here is my #4 rod bearing compared to another from a different cylinder.
# 4 has always had lower pressure and It sounded like the knock was from this rod.(no road test yet)

It is worn about .005 compared to the rest.
Did I save a failing bearing or is there other trouble brewing?

I also have a oil leak thats pretty bad now in front below the oil pump.
I can't believe that new rubber gasket is leaking up front.
Has anyone ever have an oil gasket let go at this spot.
Oh,and with the new pan gasket I changed to full synth after running semi for 2 years.
_________________
1978 924 95 mile daily driver.
Audi TB/POR174M/High Flow Cat/2.25" exhaust
I knew that positive thinking thing wouldn't work.

Mike924 · Joined: 12 Aug 2004 Posts: 2601 Location: IoW UK

The No 4 bearing is the one in the top of the photo, right?

The wear patterns look fairly normal to me. (Your car must have racked up quite a mileage by now?) OK, so there's some evidence of poor lubrication on the top bearing, but I think you caught it in time and I don't think it's a sign of anything else gone wrong, just general wear and age. Keep an eye on it though.

Do I understand that you changed the bearings with the engine in the car?

(My car has a slight leak from the oil pump - makes a mess of the radiator bottom hose

)
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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

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John Brown · Joined: 07 Nov 2002 Posts: 903 Location: Leesburg VA

Not horrible. But more than normal wear; from the picture it appears the top layer was starting the flake. But I'd guess your crank is probably still OK. If the crank checks visually OK then you're good to go.

Pan seals are like that , yes they are. Practice makes perfect!
_________________
John
80 931 - #931 44Cup
99 Escalade - tows track cars
gone but not forgotten: original 924.org car - 82

924RACR · Posted: Tue Jul 05, 2005 9:48 pm Post subject:

Yes, you need a good bit of good gasket sealant in my experience to make that thing seal. Best thing found yet is a copper-coloured gasket sealer RTV silicone product from Elring (the gasket company) called Dirko. My pan doesn't leak anymore, always used to with Permatex's RTV silicone.
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

Joes924Racer · Posted: Wed Jul 06, 2005 12:52 am Post subject:

I got mine to seal up without anything added. .. though
I rememebr the time when i pinched
the rear rubber gasket and a 1/2 piece broke off resultng losing
all the oil on startup...you know doin the pan job with the motor
in the car is kind of tougher thats what I found to be true anyways.
good luck & good job.
_________________
1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

-nick · Joined: 16 Nov 2002 Posts: 2699 Location: Cambridge, MA

I'm guessing the bottom bearing is the bad #4 bearing? The top coating has worn off and it's down to the copper colored stuff. Definitely time to replace! You probably caught it just in time, I don't think they like to run on the copper colored material for very long.

It looks well grooved also? Was the journal perfectly smooth to touch for #4? If so, you're fine, if not, it needs turned and the new bearing won't last very long.

I learned this the hard way the first time I put an engine together at 16...

PS- I always use hylomar permatex for all my gasket. It's the best I've found. Stays soft and you can reuse your paper gaskets. I smear a thin layer over every gasket.

nick

Slam · Posted: Wed Jul 13, 2005 2:19 am Post subject:

Hey, augidog, how bad was your knock before you changed the bearings? What did your oil look like? Gracie's 931 is knocking like mad and we're gonna do the rod bearings and hope that fixes things.
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'84 944 - kid blew motor
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'78 924 - gone
'77 924 - rusting comfortably

MAD-924 · Joined: 05 Apr 2003 Posts: 55

Yes, Hylomar, great stuff. I've used this stuff alot with great results including on my non-leaking oilpan. However I don't remember using anything on the front and rear rubber seals- it's been awhile though.
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79 924 Sebring

augidog · Joined: 03 Mar 2003 Posts: 1360 Location: New Jersey

Gram · Posted: Wed Jul 13, 2005 9:00 am Post subject:

Did you take a look at the mains while you had the pan off..?
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'82 924 NA Euro (hers)
'98 Audi A4 TDI (ours)

Joes924Racer · Posted: Wed Jul 13, 2005 9:50 am Post subject:

You cant take a look at the mains with the crank still in
well I guess you could look at the cap side .. if thats enough..
hmmm maybe someone wants to tell a story of how they hulked
the crank out with the block still in the car to get to the main bearings
Youd have to make a special crank holder that fits on a jack to get it
down so you could pull the mains.. Ive replaced pistons and rod bearings in the car twice each time doing one & the other the next time. If
you ever want to pull the motor and dont have a motor puller just tear it down to the blockthen straddle it and pull it off the bell housing. Putting it in
is just the reverse I can do it thats cause Im a hulkster.
_________________
1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

augidog · Joined: 03 Mar 2003 Posts: 1360 Location: New Jersey

Hey Joe,
Do the rods just pull out?
I would pull the crank and do the bearings if it was possible.Is the flywheel easy to come off with just the oilpan off.
Did you break in your new rings correctly?
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_________________
1978 924 95 mile daily driver.
Audi TB/POR174M/High Flow Cat/2.25" exhaust
I knew that positive thinking thing wouldn't work.

kaffine · Joined: 13 Jun 2003 Posts: 644 Location: Las Vegas

You wont get the flywheel off without pulling the trans or the engine the clutch has to come off to access the bolts holding the flywheel to the crank.

The flywheel doesn't have to come off to do the main bearings though. You should be able to slide the top bearing around to remove it. I will say I haven't done it on a 924 and german engineers have ways of making life difficult but it should be possible.

The rods will come out from the top of the block with the piston. It is preferable that the head be removed first otherwise alot of damage will occur

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80 924
80 931

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Joes924Racer · Posted: Thu Jul 14, 2005 5:20 am Post subject:

mains are stout anyways.. I wouldnt want to try to replace the mains
this way with the flywheel attached no=sir ited be tough at best.
Augidog did a good job.
_________________
1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.