Impreza big end bearing failure/rebuild

nitros44
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Impreza big end bearing failure/rebuild Mar 18, 2014 21:47:43 GMT 1

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Post by nitros44 on Mar 18, 2014 21:47:43 GMT 1

You know when you here that bottom end knocking/rumble!!
This is what you might find has happened,the engine ran short of oil to the extent the shell bearing worn to the point it was being "hammered " between crank and conrod,it got worn so thin the shell spun round inside the conrod and damaged both rod end caps and crank journal.
The shell bearing at lower part of the photo is the hammered one.look closely and you'll see what I mean.
The engine is from a wrx impreza that belongs to a friend which iam just about to start rebuilding,he has give me a substantial budget.
More posts to come on the rebuild soon.
Please feel free to comment with any tips or ideas regarding this topic that will help with the rebuild.
Thank you

I might not be the best,but i was always in the top one

phaetonott MOT tester Posts: 1,611 Class tested: 4 Last Online: Nov 6, 2020 17:49:52 GMT 1 Likes: 399	Impreza big end bearing failure/rebuild Mar 18, 2014 22:21:53 GMT 1 Back to Top Quote Select Post Deselect Post Link to Post Back to Top Post by phaetonott on Mar 18, 2014 22:21:53 GMT 1 Hmmm Brave man nitros44
	Simon I am never right but at least I am trying

nitros44
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Impreza big end bearing failure/rebuild Apr 2, 2014 19:38:20 GMT 1 via mobile

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Post by nitros44 on Apr 2, 2014 19:38:20 GMT 1

After taking the Micky out the guy who owns this car I had to eat humble pie as it turned out the oil pump had failed, not his incompetence to regular check his oil.
Within the pump to bolts had come slack and the plunger inside had stuck effecting its ability to maintain pressure.
Got everything now to prepare for rebuild

I might not be the best,but i was always in the top one

nitros44
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Impreza big end bearing failure/rebuild Apr 2, 2014 21:19:00 GMT 1

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Post by nitros44 on Apr 2, 2014 21:19:00 GMT 1

Here's a couple of grands worth of parts,
Not got the bill for the machining yet for the block rebore due to oversize race pistons and crank regrind.
Got a good deal on the pistons which are STI version 8 race pistons,should of been £350.00 +vat each,yes each!!!paid £600 all in, however had to by rings for them,another £200.00 for the rings.
Forged rods are Manley got a good deal £500 for the set.
Made a start on the rebuild earlier this evening

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I might not be the best,but i was always in the top one

nitros44
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Impreza big end bearing failure/rebuild Apr 2, 2014 21:30:22 GMT 1

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Post by nitros44 on Apr 2, 2014 21:30:22 GMT 1

Not many places can cater for re grinding impreza cranks due how narrow the crank is,ended up trying 3 places to have it done ,but they have made a real good job

Nice piston if you like that sort of thing.

Nice job of the block

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I might not be the best,but i was always in the top one

nitros44 MOT tester Posts: 3,900 Class tested: 4, 7 Last Online: Mar 6, 2013 1:09:15 GMT 1 Likes: 2,045	Impreza big end bearing failure/rebuild Apr 2, 2014 21:38:06 GMT 1 Back to Top Quote Select Post Deselect Post Link to Post Back to Top Post by nitros44 on Apr 2, 2014 21:38:06 GMT 1 Well that's it for today Bearings in crank and pistons in Just need to bring both halves of the blocks back together, Maybe tomorrow night with a few beers again Attachments:
	I might not be the best,but i was always in the top one

Deleted Posts: 0 Last Online: Nov 21, 2024 18:05:47 GMT 1	Impreza big end bearing failure/rebuild Apr 2, 2014 21:56:04 GMT 1 via the ProBoards App nitros44 likes this Back to Top Quote Select Post Deselect Post Link to Post Back to Top Post by Deleted on Apr 2, 2014 21:56:04 GMT 1 Nice report

nitros44
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Impreza big end bearing failure/rebuild Apr 11, 2014 22:03:48 GMT 1

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Post by nitros44 on Apr 11, 2014 22:03:48 GMT 1

Update.
STI steel head gaskets in place ready for the cylinder heads to be fitted
Heads in place and managed to start the engine detailing regards paint.
Block and heads had a coat of very high temp primer this afternoon.

Although the cylinder head bolts are useable again, I decided to use new ones

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Last Edit: Apr 11, 2014 22:09:59 GMT 1 by nitros44 -

I might not be the best,but i was always in the top one

nitros44
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Impreza big end bearing failure/rebuild Apr 15, 2014 21:32:21 GMT 1

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Post by nitros44 on Apr 15, 2014 21:32:21 GMT 1

Managed to get the engine painted last night, starting to look the business now.
Just waiting for the camshafts which i had reprofiled to my own specs by the machine shop to come back.
To purchase the new ones from a supplier required cost over 700 pound ,a good tip when it can be done is to have the old ones reprofiled by a machine shop that knows what there are doing regards this type of machining,it helps as it keeps the costs in check.
I've just snapped a bolt in the head so iam off to drill and tap it , after I've had a be vie!!

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I might not be the best,but i was always in the top one

Gaz VTS Council member Posts: 2,157 Class tested: 4, 7 Last Online: Sept 7, 2019 10:16:48 GMT 1 Likes: 739	Impreza big end bearing failure/rebuild Apr 15, 2014 23:38:26 GMT 1 via mobile Back to Top Quote Select Post Deselect Post Link to Post Back to Top Post by Gaz on Apr 15, 2014 23:38:26 GMT 1 Looking nice nitros44
	Specialising in repairing & rebuilding Vauxhall 6 speed gearboxes www.m32guy.co.uk - info@m32guy.co.uk

nitros44 MOT tester Posts: 3,900 Class tested: 4, 7 Last Online: Mar 6, 2013 1:09:15 GMT 1 Likes: 2,045	Impreza big end bearing failure/rebuild May 15, 2014 13:58:28 GMT 1 baz657 and pete like this Back to Top Quote Select Post Deselect Post Link to Post Back to Top Post by nitros44 on May 15, 2014 13:58:28 GMT 1 Frankenstein is ready to go back in! Attachments:
	I might not be the best,but i was always in the top one

nitros44 MOT tester Posts: 3,900 Class tested: 4, 7 Last Online: Mar 6, 2013 1:09:15 GMT 1 Likes: 2,045	Impreza big end bearing failure/rebuild May 15, 2014 14:03:21 GMT 1 Back to Top Quote Select Post Deselect Post Link to Post Back to Top Post by nitros44 on May 15, 2014 14:03:21 GMT 1 Another one for the album Attachments:
	I might not be the best,but i was always in the top one

nitros44
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Impreza big end bearing failure/rebuild May 15, 2014 21:29:21 GMT 1 via mobile

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Post by nitros44 on May 15, 2014 21:29:21 GMT 1

When connecting up the engine loom one thing I could not find and I know this sounds daft cant rememberer taken it out was an oil pressure switch.
Having a new one to go in the hole where it goes had the original oil gallery plug installed,
The wire although present within the loom had been fastened out the way.
After quizzing the owner regards any switch being removed or a gauge fitted instead the answer was neither.
He never ever noticed that the oil warning lamp on the dash never worked.
Well it all becomes apparent now what happens when something goes wrong and no warning system is in place.
Looks like the owner is in for some technical training

I might not be the best,but i was always in the top one

Gaz VTS Council member Posts: 2,157 Class tested: 4, 7 Last Online: Sept 7, 2019 10:16:48 GMT 1 Likes: 739	Impreza big end bearing failure/rebuild May 16, 2014 7:13:11 GMT 1 via mobile Back to Top Quote Select Post Deselect Post Link to Post Back to Top Post by Gaz on May 16, 2014 7:13:11 GMT 1 Such a simple thing could of saved so much money. That's if he bothered to do anything about the light that is.
	Specialising in repairing & rebuilding Vauxhall 6 speed gearboxes www.m32guy.co.uk - info@m32guy.co.uk

ivor MOT tester "Failure is always an option." Mythbusters Posts: 1,981 Class tested: 4, 5L, 7 Last Online: Apr 8, 2023 11:19:45 GMT 1 Likes: 720	Impreza big end bearing failure/rebuild May 17, 2014 21:07:31 GMT 1 Back to Top Quote Select Post Deselect Post Link to Post Back to Top Post by ivor on May 17, 2014 21:07:31 GMT 1 Good report. Is it running ok now ?

nitros44 MOT tester Posts: 3,900 Class tested: 4, 7 Last Online: Mar 6, 2013 1:09:15 GMT 1 Likes: 2,045	Impreza big end bearing failure/rebuild May 18, 2014 20:22:28 GMT 1 via mobile Back to Top Quote Select Post Deselect Post Link to Post Back to Top Post by nitros44 on May 18, 2014 20:22:28 GMT 1 May 17, 2014 21:07:31 GMT 1 ivor said: Good report. Is it running ok now ? We're going to put it on the dyno bench 1st for 1/2 an hour then drop it in the car mid week(work permitting )
	I might not be the best,but i was always in the top one

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Post by nitros44 on Mar 18, 2014 21:47:43 GMT 1

Post by phaetonott on Mar 18, 2014 22:21:53 GMT 1

Post by nitros44 on Apr 2, 2014 19:38:20 GMT 1

Post by nitros44 on Apr 2, 2014 21:19:00 GMT 1

Post by nitros44 on Apr 2, 2014 21:30:22 GMT 1

Post by nitros44 on Apr 2, 2014 21:38:06 GMT 1

Post by Deleted on Apr 2, 2014 21:56:04 GMT 1

Post by nitros44 on Apr 11, 2014 22:03:48 GMT 1

Post by nitros44 on Apr 15, 2014 21:32:21 GMT 1

Post by Gaz on Apr 15, 2014 23:38:26 GMT 1

Post by nitros44 on May 15, 2014 13:58:28 GMT 1

Post by nitros44 on May 15, 2014 14:03:21 GMT 1

Post by nitros44 on May 15, 2014 21:29:21 GMT 1

Post by Gaz on May 16, 2014 7:13:11 GMT 1

Post by ivor on May 17, 2014 21:07:31 GMT 1

Post by nitros44 on May 18, 2014 20:22:28 GMT 1