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carrotbay

Member Since: 18 Aug 2013
Location: Northants, UK
Posts: 702

2008 Defender 110 BMW M57 3.0 Diesel XS CSW Auto Santorini Black

Crankshaft replacement - DIY job

I have a problem with my 110 which is going to need a new crankshaft to fix.

Long story short, someone butched the end of the crankshaft years ago trying to replace the spigot bearing so now the bearing cannot be seated correctly. This has resulted in the inputshaft of the gearbox flapping around and the box slowly destroying itself.

It's been like this for a year or so, but I think I'm on borrowed time now as the box feels and sounds terrible.

So I need to change the box and crank.

Is it possible to do a crank change without stripping the top end? Also could it be done in situ? I'm tight on space so would prefer not to have to take the engine out if possible.

Alternatively, I could find a good engine and box from someone doing a M57 swap and change the lot, but it's a bit risky not knowing the condition first.

Thoughts?

25th Nov 2023 9:29am

MK

Member Since: 28 Aug 2008
Location: Santiago
Posts: 2461

2007 Defender 110 Puma 2.4 SW Chawton White

IIRC to remove the crankshaft you need to remove the oil pan and then the stiffener plus other bits of the timing mechanism. Anyway, 2 things. 1) obviously a lot easier to work with the engine out of the car and 2) engines are a box of surprises.

I rekon it can be done.

PS depending on the damage, a good machinist could fix the seat of the pilot bearing. Puma 110" SW

.............................................................
Earth first. Other planets later

25th Nov 2023 11:25am

andy63

Member Since: 30 Jun 2023
Location: north east
Posts: 678

I'm thinking the issue will be the setting up of the engine again..how is the engine timing set up.. Do you need access to the crankshaft sensor mount to do it etc etc..
I think it would be a better and safer bet to remove the engine, even if you could drop the crank with it in situ..

25th Nov 2023 11:42am

Siwynne

Member Since: 04 Nov 2016
Location: West lancs
Posts: 594

If you are going as far as the crank just buy a full rebuild kit. Crank pistons rings bearings gaskets head bolts etc. and a new oil pump. And a timing chain cover. And a cover alignment tool. with a good crane and engine stand it’s less than a day to get it out a couple of days diy to strip and rebuild and another to put it back if there is somewhere dry to work.
It’s definable doable but the engine should be out as you can’t separate the stiffener due to the crank seal being bolted to it.

25th Nov 2023 3:28pm

Siwynne

Member Since: 04 Nov 2016
Location: West lancs
Posts: 594

Didn’t read the box was coming out so it is doable

25th Nov 2023 3:59pm

MK

Member Since: 28 Aug 2008
Location: Santiago
Posts: 2461

Unless the latter is a summarized summary, I would never follow such path. Puma 110" SW

.............................................................
Earth first. Other planets later

25th Nov 2023 4:52pm

100inch

Member Since: 15 May 2012
Location: Brunswick
Posts: 411

2010 Defender 110 Puma 2.4 CSW Santorini Black

If you think the damage is only on your crank, I suggest you talk to people who do site based flange machining on pressure equipment (pressure piping/ vessels).
Maybe easier oversizing the bore in situ (obviously box has to come out) and get an oversize pilot bearing made. Most of their equipment is air driven, but for smaller flanges we actually use hand operated gear as you only take off small amounts . M

25th Nov 2023 8:23pm

NickMc

Member Since: 01 Oct 2014
Location: Norn Iron
Posts: 1681

I would take the engine out to repair that. The bearings are hard to replace without the tool. I have a polished genuine crank here on the shelf

25th Nov 2023 9:26pm

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