Crankshaft seal

Do I need drain oil to change crankshaft seal?

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No

 

Also when I put my finger on inside of seal seams to be a gap and finger gets covered in oil

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Thats the idea of the seal, it seals against the flywheel and keeps the oil in

 

Yeh I mean now got flywheel of I can get finger behind seal

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Where arrow is

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It seals on the flywheel

 

I think he means the gap at the back of the seal to the case. But I don’t see what the issue is, apart from oily fingers.

 

That's correct, hopefully there are 3 shims rattling around in there. 3 not 1 or 2 ....3

 

Shims what shims

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The three shims that should be under the seal when you prise it out

 

Ah okay not got that far . So should be 3? Also similar question if changing pushrod tubes do I drain oil

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The oil sits at the bottom of the engine below the pushrod tubes so they can drain the oil from the cylinder heads. Same with the oil seal at the front of the engine, there is a hole inside the engine block where the oil drains back into the engine. At the other end, there is actually a small gap by the pulley that contains a crude air pump to pressurise the engine block slightly with air.

There should be three shims in there, all smooth, no grooves, taking the thrust of the clutch pedal when you put your foot on the pedal. They wont come out without taking out the seal, dont damage them or the engine case while getting the seal out if you want to replace it.


The oil in the sump sits about level with the bottom of the oil pump. Oil wont come out of the sump even if you do remove the oil pump with the oil in the engine, some may come back out of oil galleries higher up.

The main thing with changing pushrod tubes is to make sure that any sealant is cleaned up - provided the surfaces are clean and reasonably smooth and the pushrod tubes are stretched to the correct length, the rubber seals will stop any leaks without sealant.

You might change the oil anyway after doing a job where like with the pushrod tubes you might be disturbing sealant if it was bodged before with sealant. You would not really want bits of silicone floating around in the oil - the strainer should catch it but some will go through.

 

Just to throw a spanner in the works, all the above posts (I think) are talking about the flywheel end- do you mean the pulley end?

 

He means the flywheel end. Not much happening down by the pulley.

 

.....there's this seal happening:
https://www.customandcommercial.com...y_oil_seal_1700cc-2000cc_type_4_engines_9948/

But I've just read properly and can see OP mentions flywheel coming off.... so I'll get my coat

 

And he did post a photo of it in situ in his opening post.

Then again neither is a crankshaft seal - one is flywheel seal, the other is a fan hub seal.

 

I see no image? just a "

 

That would explain it!