Another rear crank seal question...

turrican · Nov 12, 2018

With my 200tdi I have noticed that when I was driving the teflon seal into the flywheel housing it was very tight and parts of the green (teflon?) was coming off and sticking to the side. Is this normal??

In the end I bitched the seal as it was tight and i need a better driving tool.

tottot · Nov 12, 2018

I did my 200tdi last August.I do not think the green is the teflon,recon it is someting to stick the seal in the housing.I also found the seal unwilling to go in so stuck it in the freezer for half an hour and then it tapped in easly.
Some folk fit an ordinary oil seal instead of the Dowty seal.

turrican · Nov 12, 2018

That's a good idea using the freezer, will definitely do the same with the replacement.

I always thought the green stuff was needed to create a good seal all the way round instead of just keeping the seal in place.

jamesmartin · Nov 12, 2018

turrican said:
With my 200tdi I have noticed that when I was driving the teflon seal into the flywheel housing it was very tight and parts of the green (teflon?) was coming off and sticking to the side. Is this normal??

In the end I bitched the seal as it was tight and i need a better driving tool.

the teflon is a coating on the seal lip,crank and seal must be perfectly dry and clean even from fingers rubbing on the surfaces, when started the teflon coats the crank were the seal will contact, and create a long wearing contact surface between seal and crank,theres no garter spring to ensure lip is pressed onto the crank it relies on the seal having a memory to hold against the shaft excessive stretching when fitting will interfere with that

turrican · Nov 12, 2018

jamesmartin said:
the teflon is a coating on the seal lip,crank and seal must be perfectly dry and clean even from fingers rubbing on the surfaces, when started the teflon coats the crank were the seal will contact, and create a long wearing contact surface between seal and crank,theres no garter spring to ensure lip is pressed onto the crank it relies on the seal having a memory to hold against the shaft excessive stretching when fitting will interfere with that

Cool thank you for explaining, I was very careful not to touch anything and keep everything clean and dry.

micknkatenki · Nov 12, 2018

when I did mine on a 300tdi defender I got the one from Turner Engineering, its a good quality one and comes with a plastic sleeve which pops out when you fit the seal over the crank, nice and easy to do.

turrican · Nov 12, 2018

micknkatenki said:
when I did mine on a 300tdi defender I got the one from Turner Engineering, its a good quality one and comes with a plastic sleeve which pops out when you fit the seal over the crank, nice and easy to do.

Got the plastic sleeve with mine as well. The issue was getting the seal into the flywheel housing, was very tight and ended up putting a dent in the seal. Hopefully with a better tool and using the freezer method next one will go in better.

Britcyclerider · Nov 12, 2018

I put a thin smear of engine grade silicon on the seal body ( not the lip!).

lynall · Nov 13, 2018

I had one of the new style seals come loose in the rear of a 200 flywheel housing, so new one got some loctite and its been fine since, lot of work for a bloody seal!

turrican · Nov 27, 2018

2nd time worked a charm, took my time and all looks good. I should really buy seals in pairs!!!

tottot · Nov 27, 2018

Good you have got it fixed.

Rob 90 · Nov 27, 2018

If not too late run it for 5 minutes before putting gearbox back on just to check. When I replaced mine and got it all back together it leaked and had to remove it all again. I had used a cheep imitation Dowty seal, the second time I got one from Turner Engineering which was much easier to fit (and did not leak). I also used the freezer method as advised to me on a previous thread.

turrican · Nov 27, 2018

Would like to run this now but is part of a rebuild and everything is scattered about the garage.
Once I got bulkhead in and it wired up I will definitely run it before going any further.
I didn't go for the turner seal but used a bearmach oem g one. We'll see how that goes.....

Another rear crank seal question...

turrican

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tottot

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turrican

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jamesmartin

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turrican

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