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Overfilled at oil change

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Discussion

Harrai

Original Poster:

9 posts

6 months

Sunday 8th October
quotequote all
Hi all

I have a Jeep Wrangler TJ 4.0.

Recently the workshop overfilled the oil by approximately 1 litre. I drove home, approximately 30 miles before noticing, and immediately drained off some oil to the correct level.

I have since noticed a small oil leak from the front crankshaft seal. Is this likely to be excess oil from overfilling? Will is fix itself when the oil in that area of the crankshaft has leaked away? Or will I need to replace the crankshaft seal?

Thanks

Harrai

sunbeam alpine

3,522 posts

110 months

Sunday 8th October
quotequote all
I wouldn't expect a 1 litre overfill to cause that sort of problem. A leaking crankshaft oil seal will need fixing, and depending on the motor/layout, can be either an easy job or a complete bd!

Harrai

Original Poster:

9 posts

6 months

Sunday 8th October
quotequote all
Thanks for your response. Might have been a bit more than one litre - 2 or 3 cm on the dipstick. There was no leak on the crankshaft before the oil change

227bhp

5,471 posts

50 months

Sunday 8th October
quotequote all
If you've drained it off you should know how much came out.

Harrai

Original Poster:

9 posts

6 months

Sunday 8th October
quotequote all
227bhp said:
If you've drained it off you should know how much came out.
I didn't measure it exactly.

What I'm trying to establish is if the leak at the crank is temporary due to overfilling, or if seal is likely to have blown.
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DuraAce

2,241 posts

82 months

Sunday 8th October
quotequote all
Harrai said:
I didn't measure it exactly.

What I'm trying to establish is if the leak at the crank is temporary due to overfilling, or if seal is likely to have blown.
Impossible to say with certainty.

Half litre overfill = not a problem

Ten litre overfill = definitely a problem

Though to define where the crossover point is.

Could be a total coincidence (or you hadn't noticed it previously)

Clean it up and monitor it now level is correct.

Don't waste any effort/thoughts/expense on thinking that the garage will fix the seal for free - not a chance IMHO!

Harrai

Original Poster:

9 posts

6 months

Sunday 8th October
quotequote all
DuraAce said:
Impossible to say with certainty.

Half litre overfill = not a problem

Ten litre overfill = definitely a problem

Though to define where the crossover point is.

Could be a total coincidence (or you hadn't noticed it previously)

Clean it up and monitor it now level is correct.

Don't waste any effort/thoughts/expense on thinking that the garage will fix the seal for free - not a chance IMHO!
Thanks for your response. I'll clean up and see how it goes.

I wasn't contemplating asking for a free fix - it's an old car, and things need repairing every so often

Boosted LS1

16,404 posts

182 months

Sunday 8th October
quotequote all
If the oil level was up to the seal then yes some excess oil may have seeped out but I doubt damage has been done to the seal. It may dry up after a while.

Also check your pcv circuits working and not clogged up. It helps create vacuum in the crankcase.