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Gtir Motorsport club » Tech room » Gearbox section » Why too much sealant might trash your gearbox

Why too much sealant might trash your gearbox

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Cosmic73

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I'm working on this failed GTIR gearbox that looks like it's been recently refurbished as the bearings sounded and felt new and the lube oil was pristine.
So why is it failed?
The first thing i noticed was just how much sealant was used. All they need is a very thin bead of sealant but this had been put on with a trowel and had oozed out into big lumps into the gearbox.


Big clods of the stuff where caught in the bearings, oil ways etc,


I noticed that the 5th gear synchro springs had snapped and gone into mesh which is very unusual as it's usually 2/3.
5th synchro is near where the clods are so i reckon a clod had got caught, misaligned the synchro, then snapped of the springs.
Found bits of the spring on the magnet but also in the diff bearing which will need replacing.

mike74

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defo looks like a brickie put that box back together last time! Shocked

gtir_woody

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moderator
moderator
It’s so easily over looked by people, Brand new engines destroyed by too much sealant, people get scared of it leaking and don’t realise they should be more worried about the damage too much can cause

Mr B

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gtir technician
gtir technician
I seen this issue with sealants a lot on engines mainly , why people use that awful red stuff and lay it on like brick mortar joints I no idea .
Ideally want smear the joint surface for very flush fit scenarios or have very thin bead offset towards outer edge .
As soon as I see that red shit I know it likely fun and games repair job :-)

Ryaneg6freak

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Red silicone! who does that!!

Cosmic73

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This is why you must strip down a failed gearbox to the bone. This is the input shaft with the gears removed and as you can see the oil holes are totally blocked up!

7 Re: Why too much sealant might trash your gearbox on 5th November 2018, 10:15 pm

gtir_woody

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moderator
moderator
That would have been bad news if it wasn’t completely stripped

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