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Crank sensor replacement-TDC?

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Crank sensor replacement-TDC?

Postby Piglet » Thu Sep 06, 2018 10:06 am

Mr. Haynes tells me I need to set the crank at TDC before removing sensor. (08 Tdci)
Why?
Can't find much about it except 2 posts saying not necessary.
Thanks
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Re: Crank sensor replacement-TDC?

Postby loot » Sat Sep 08, 2018 11:11 pm

The sensor has an air gap and the teeth of the flywheel are slightly different height between them and the gap, I'm presuming that where it tells you to set the tdc should see you just off the peak of the tooth on the flywheel and that means when you install a new sensor then it will allow a more reliable gap.
That or it will stop a fault code being generated or the ignition cycle being correct and not upsetting the fuel injected/flooding.

All of the above though sounds like a bollox reason to be a problem.

Personally I think it isn't a problem if you are careful, i usually gently offer the sensor into the hole while I manually slowly crank the crank pulley around and I can feel the teeth scraping on the sensor then I feel for the tooth at it'd highest then I lock the sensor in and then it's done.

That's just my thoughts though. :-)

You could always just do what it says and rest easy though :P
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Re: Crank sensor replacement-TDC?

Postby Piglet » Mon Sep 10, 2018 2:59 pm

Thanks Loot, all taken on board.
It can't be that hard.

not as hard as taking the A/C compressor & alternator & bracket off just to get to the TDC hole!
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Re: Crank sensor replacement-TDC?

Postby Kenton » Mon Sep 10, 2018 8:55 pm

Sorry to barge in guys. Where bouts is the crank sensor located on the TDCi? Mines an 05 - whether that matters or not.

Cheers.
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Re: Crank sensor replacement-TDC?

Postby Piglet » Mon Sep 10, 2018 10:39 pm

I'm assuming it's under the turbo somewhere, I'll let you know when I can be arsed to crawl under and look.
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Re: Crank sensor replacement-TDC?

Postby Kenton » Tue Sep 11, 2018 9:56 am

Piglet wrote:I'm assuming it's under the turbo somewhere, I'll let you know when I can be arsed to crawl under and look.

Nice one, cheers.
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Re: Crank sensor replacement-TDC?

Postby Piglet » Wed Sep 12, 2018 11:21 am

OK, so on my 2008 Tdci it's just behind the sump pan flywheel end.
Easy access, 7mm 1/4" drive socket & small ratchet ideal. Screw surprisingly tight for a tiddler.

Haven't tried pulling the sensor out yet, waiting for the new one.
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Re: Crank sensor replacement-TDC?

Postby Kenton » Wed Sep 12, 2018 2:04 pm

Great bit of info! Thanks for taking the time Piglet.
2005 T230 LX 90 TDCi LWB
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Re: Crank sensor replacement-TDC?

Postby Piglet » Thu Sep 13, 2018 2:08 pm

Sensor replaced.
Didn't really get the bit about setting the insertion depth, the old one appeared to be right in so I inserted the new one the same but left the screw loose while I rotated the crank via the road wheel, sensor didn't move back or make any noises so it nipped it up where it was.
It runs and hasn't gone bang,,yet.
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