Member Since: 24 Feb 2021
Location: West midlands
Posts: 12
Engine issues - snapped crank
Hello all. Relatively new here but you fine people helped me out recently with a key issue so thought I would ask more questions, this time related to the engine.
I have a Discovery 3 that I got as a donor with a locked up engine. I was bored this weekend so pulled the body off (with the help from a fantastic guide from here), pulled the engine and box and part dismantled the engine. It turns out the cranks snapped.
I was wondering what damage, if any, this does to the heads/ valves. Also is the crankshaft the same as the one fitted in to the Citroen/ Peugeot range? (407,C6) as my friend has a breakers yard so happens upon these more often than land rovers.
Any replys greatly appreciated
6th Mar 2021 9:04 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10360
The crank maybe the same.
Bell housing is different.
6th Mar 2021 9:42 pm
Gti_bob
Member Since: 24 Feb 2021
Location: West midlands
Posts: 12
Yeah I read that the drillings in the block were different around the bell housing but I wasn't sure with the crank. I've tryed Google for part numbers for the crankshafts but had no luck.
6th Mar 2021 9:46 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10360
regarding the heads.
You can pour petrol into the inlet / exhaust tracks and see if any of it leaks.
6th Mar 2021 9:52 pm
Motolab
Member Since: 18 Oct 2019
Location: Sleen
Posts: 1815
Gti_bob wrote:
Yeah I read that the drillings in the block were different around the bell housing but I wasn't sure with the crank. I've tryed Google for part numbers for the crankshafts but had no luck.
I think that if in case of a snapped crank, your crankcases are warped (somehow)
So just a “new” crank...... is not a reliable solution IMHO...Best regards
Harold
Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year
Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc.
6th Mar 2021 10:45 pm
Gti_bob
Member Since: 24 Feb 2021
Location: West midlands
Posts: 12
Thanks for the input everyone. Would it be a case for line boring the mains if it warps things?
Does it cause damage to heads or valves?
I've replaced cranks in BMW engines when they snap and there just a chuck it in and away you go job. I've never had an issue with reliability.
Also has the issue with the cranks snapping been resolved with the aftermarket or replacement cranks?
Sorry if all of these questions have been covered in other posts but information is a bit of a minefield with these things.
7th Mar 2021 7:28 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4628
Member Since: 24 Feb 2021
Location: West midlands
Posts: 12
Ah right. Looks like it might be a breaker then. Mileage and age don't warrant a big spend plus it's in my way really.
Are there any conversions available for the D3? I've seen BMW engines and Merc OM606 engines put in defenders but I know the electrics and electronics are far more complex in the D3.
7th Mar 2021 7:48 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4628
The popular approach is to perhaps locate a Jag S type and swap over the D3 bits. They are becoming harder now to find though as many have already been scrapped.
As for conversion, the only one which would make sense is a TDV8 from a Range Rover, but that might be harder to find than the Jag. yµ (idµ - eAµ) ψ=mψ
7th Mar 2021 7:54 pm
motorworks
Member Since: 14 Nov 2019
Location: Usk
Posts: 401
If you are charging a customer serious money to fix a broken engine then working within tolerances is necessary to achieve best reliability, even then things can fail.
Own vehicle repairs are a different ball game. Simply replacing a crank may be good for thousands of miles, but there is an element of doubt, and on average cheaper solutions have a shorter life.
Many would say that fitting a used crankshaft in any LR 276DT or 306DT engine is too risky considering the labour involved.Chris
7th Mar 2021 7:59 pm
Gti_bob
Member Since: 24 Feb 2021
Location: West midlands
Posts: 12
Yes I'm currently watching a couple on copart but the worry is that the same could happen. The whole car only owes me £800 and it came with 4 brand new tyres (which I used on my daily driver), a fixed Witter towbar and the removable one plus it's got all the trick bits like satnav and the fridge coolbox thing in the arm rest so would break well.
I've used some odd bits and pieces such as arch trims for a salvage one that I've replaced the rear quarter on but a friend's asked about buying it if it could be made to run. He's a nice old bloke so I'd do the work for free as I'd be learning in the process which is never a bad thing.
7th Mar 2021 8:03 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4628
Personally, I'd rebuild the bottom of the donor engine (bearings, oil pump, + new belts, idlers, and WP, etc. (You do not want to be going in there twice!) It sounds like it doesn't owe you much, so if you consider the car to be in otherwise good order it's perhaps worth considering.
The thing is all this adds up when you add in gaskets, bits and bobs, and likely a few other parts on top of the outlay of the engine.
It would give you some peace of mind though if it's going to be a "keeper".yµ (idµ - eAµ) ψ=mψ
7th Mar 2021 8:23 pm
Gti_bob
Member Since: 24 Feb 2021
Location: West midlands
Posts: 12
Yes that's the dilemma. The labour sides not an issue as I enjoy working on it but it's quite involved moving my unit around to get the body on and off.
I will make some calls tomorrow to price up some stuff. If it's not viable I may just break it
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