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Seized Fill Bolt on Rear Diff

 
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disallow
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Joined: 13 Aug 2008
Posts: 2714
Location: Winnipeg, Canada

PostPosted: Wed Aug 14, 2019 3:02 pm    Post subject: Seized Fill Bolt on Rear Diff Reply with quote

Hey everyone,

So I decided its time to change my diff fluid. Went to remove the upper fill bolt, and can't get it to budge. Even went so far as to get a 10mm hex socket, get it seated in the hex hole really good, and try my breaker bar. It wouldn't go, so I though I'd even try my air impact. No movement. Though now if I let it go on the impact, it does spin inside, so I guess I've rounded the hex a bit now too. Lovely.

Any ideas?

t
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Terry in Winnipeg

'05 Pathfinder SE Premium 4x4 - 343000kms (213000mi) - weekend warrior, Cortex Superchips on 87 Octane Tune, K&N filtercharger, Airlift 1000, Prodigy Brake controller, 7 pin trailer hookup, Prostart Remote Starter, Cooper Discoverer ATw P265/70/16
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smj999smj
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Joined: 22 Jan 2012
Posts: 5321
Location: Prospect, VA

PostPosted: Wed Aug 14, 2019 5:05 pm    Post subject: Reply with quote

I would get a propane torch and carefully heat the case round the fill plug and then use and air chisel on the edge of the plug to try and break it loose.
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2006 Pathfinder LE VQ40DE AWD, aftermarket radiator, Airlift 1000's, Bilstein HD rear shocks, Doug Thorley shortie headers and mid-pipes, Magnaflow 12580 muffler, aFe Momentum GT CAI w/ dry filter, XTP plenum spacer, Superchips Flashpaq tuner
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disallow
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Joined: 13 Aug 2008
Posts: 2714
Location: Winnipeg, Canada

PostPosted: Wed Aug 14, 2019 5:10 pm    Post subject: Reply with quote

Mapp gas too hot?
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Terry in Winnipeg

'05 Pathfinder SE Premium 4x4 - 343000kms (213000mi) - weekend warrior, Cortex Superchips on 87 Octane Tune, K&N filtercharger, Airlift 1000, Prodigy Brake controller, 7 pin trailer hookup, Prostart Remote Starter, Cooper Discoverer ATw P265/70/16
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Graham W
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Joined: 08 Jan 2018
Posts: 238
Location: UK, the warm end :-)

PostPosted: Thu Aug 15, 2019 2:24 am    Post subject: Reply with quote

Try soaking with some diesel.

I was taught to free seized engines with diesel without having to
strip the heads off. It’s an oil and penetrates.
Just keep soaking for about a week, worth a go.
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2005 Nissan Pathfinder 2.5 T-Spec

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smj999smj
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Joined: 22 Jan 2012
Posts: 5321
Location: Prospect, VA

PostPosted: Thu Aug 15, 2019 6:26 am    Post subject: Reply with quote

disallow wrote:
Mapp gas too hot?


It'll work, too, as long as your careful. Torque spec is only 25 lb/ft. Somebody must have really cranked on it!
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2006 Pathfinder LE VQ40DE AWD, aftermarket radiator, Airlift 1000's, Bilstein HD rear shocks, Doug Thorley shortie headers and mid-pipes, Magnaflow 12580 muffler, aFe Momentum GT CAI w/ dry filter, XTP plenum spacer, Superchips Flashpaq tuner
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disallow
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Joined: 13 Aug 2008
Posts: 2714
Location: Winnipeg, Canada

PostPosted: Sun Sep 01, 2019 7:37 pm    Post subject: Reply with quote

So I managed to get this bolt out yesterday. Used these:

https://www.princessauto.com/en/detail/5-pc-pipe-nipple-extractor-set/A-p8248486e

Worked perfectly. Got a new plug from Nissan, $18!

Cheers all.

t
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Terry in Winnipeg

'05 Pathfinder SE Premium 4x4 - 343000kms (213000mi) - weekend warrior, Cortex Superchips on 87 Octane Tune, K&N filtercharger, Airlift 1000, Prodigy Brake controller, 7 pin trailer hookup, Prostart Remote Starter, Cooper Discoverer ATw P265/70/16
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