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Have i destroyed my diff?

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drmini in aust

Post subject:

Posted: Mon Jan 04, 2010 9:52 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39764
Location: near Baulkham Hills, NSW

If still loose with the proper spacer, read my Timken bearing thread in the how-to forum.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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mini_mad_matt

Post subject:

Posted: Mon Jan 04, 2010 10:25 pm

1098cc

Joined: Tue Aug 05, 2008 8:03 pm
Posts: 1479
Location: Qld, Brisbane

Also just make sure your not using a drive flange thats worn out.

Did the old bearings look to be the cause of your problem?

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blue_deluxe

Post subject:

Posted: Mon Jan 04, 2010 10:59 pm

1275cc

Joined: Fri Apr 25, 2008 2:34 pm
Posts: 2002
Location: Brisbane

There was a bit of wear on them, but the bearing faces were still pretty smooth and clean.

The grease inside them was almost tar it was that thick. So they were on the way out. Ill finish the job off and swap the spacers over and see how i go.
Thanks for your advice everyone.

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blue_deluxe

Post subject:

Posted: Mon Jan 04, 2010 11:02 pm

1275cc

Joined: Fri Apr 25, 2008 2:34 pm
Posts: 2002
Location: Brisbane

And Doc, I read your article the how to section a while ago, and really should have reread it again before i did it.
from what i read the problem is the long spacer that i put in is causing the slop.
Oh well, live and learn, i wont be making that mistake again.

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AEG163job

Post subject:

Posted: Tue Jan 05, 2010 7:27 am

1275cc

Joined: Fri Oct 20, 2006 5:03 pm
Posts: 2729
Location: Out in the shed cleaning up my own mess.

blue_deluxe wrote:

when i bolted it all back together theres a lot of play in the drivetrain (maybe 10 degrees from diff output through rubber unis into cv then onto drive flange). Is this normal? Joe

Sounds like the rubber universals could be the culprit. Not known for their longevity if subject to hard driving or they have not been installed properly (u-bolts overtightened).

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drmini in aust

Post subject:

Posted: Tue Jan 05, 2010 6:45 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39764
Location: near Baulkham Hills, NSW

blue_deluxe wrote:

when i bolted it all back together theres a lot of play in the drivetrain (maybe 10 degrees from diff output through rubber unis into cv then onto drive flange). Is this normal? I dont remember it being that sloppy before.

Classic symptoms of a worn diff pin and planet gears.
I'd change them before they go BANG and the broken pin spears a hole in the casing. Then all the oilz runs out. :cry:

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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blue_deluxe

Post subject:

Posted: Wed Jan 06, 2010 3:52 pm

1275cc

Joined: Fri Apr 25, 2008 2:34 pm
Posts: 2002
Location: Brisbane

drmini in aust wrote:

blue_deluxe wrote:

Classic symptoms of a worn diff pin and planet gears.
I'd change them before they go BANG and the broken pin spears a hole in the casing. Then all the oilz runs out. :cry:

Hi doc,
I think it is the diff pin thats gone. I swapped the spacer with the proper one and reassembled it all back together and the noise is still there.
Its also the same whether the wheels are straight or turning.

Whats worse is i sold my spare engine 2 days ago. The only reason i kept it round for 6 months is as a spare engine. Karmas a bitch.

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GT mowog

Post subject:

Posted: Wed Jan 06, 2010 6:00 pm

Mods rock!

Joined: Fri Oct 03, 2008 9:02 pm
Posts: 5079

blue_deluxe wrote:

If the noise is there whether going straight or on corners then it wouldn't be the diff pin. If it sounds like it's coming from that general area, then I'd guess at the Main shaft Bearing in the Gearbox.

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blue_deluxe

Post subject:

Posted: Wed Jan 06, 2010 11:04 pm

1275cc

Joined: Fri Apr 25, 2008 2:34 pm
Posts: 2002
Location: Brisbane

Thanks for the advice. Its off the road now, so ill have to get the engine out and split it apart to have a look.

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