crankshaft regrind or another engine - Alfa Romeo Forum
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(Post Link) post #1 of 16 Old 27-06-10 Thread Starter
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crankshaft regrind or another engine

Hi Guys, Ive got two twinsparks with big ends knocking.One engine in the car one ive removed.Ive established that if the crank damage is not to deep then a regrind and new shells cost around 80.00 as long as the regrind is possible staying within limits.Can anyone who has done this job give me a summary of the work necessary to remove the crankshaft cheers.
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With the engine out of the car, it's not too bad :-

Remove sump
Remove crankshaft bolt (VFT, left-hand thread)
Remove clutch and flywheel
Remove rear oil seal
Remove oil pump
Remove conrod caps (keep a note of which is which, they are numbered if you look closely)
Remove main bearing caps (they are numbered)
Lift crankshaft out.

With the engine in the car, it's all of the above plus removing the gearbox.

HTH,

Iain
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(Post Link) post #4 of 16 Old 28-06-10 Thread Starter
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Thanx, im learning all the time.Ive presently got 3 Alfa 147s with big end knock.I also have two good cds for Alfa repairs one copy alledgedly as used by Alfa workshops,but its a labour to get a brief oversight of whats involved. My posting has given me a good summary of the work involved thanks Ian.
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Quote:
Originally Posted by iainfm View Post
With the engine out of the car, it's not too bad :-

Remove sump
Remove crankshaft bolt (VFT, left-hand thread)
Remove clutch and flywheel
Remove rear oil seal
Remove oil pump
Remove conrod caps (keep a note of which is which, they are numbered if you look closely)
Remove main bearing caps (they are numbered)
Lift crankshaft out.

With the engine in the car, it's all of the above plus removing the gearbox.

HTH,

Iain
And UPSIDE down...

I did it with the engine out...
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Originally Posted by seymour beaver View Post
Thanx, im learning all the time.Ive presently got 3 Alfa 147s with big end knock.I also have two good cds for Alfa repairs one copy alledgedly as used by Alfa workshops,but its a labour to get a brief oversight of whats involved. My posting has given me a good summary of the work involved thanks Ian.
I've had a crank ground to use 0.7mm oversize shells...
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And UPSIDE down...
I really wouldn't fancy doing it with the engine in. Getting the (quite heavy) crank in, while persuading the main bearings to stay put, and holding it there while fitting a couple of bearing caps with my necessary 3rd hand...no thanks
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Originally Posted by iainfm View Post
I really wouldn't fancy doing it with the engine in. Getting the (quite heavy) crank in, while persuading the main bearings to stay put, and holding it there while fitting a couple of bearing caps with my necessary 3rd hand...no thanks
Not something i would consider, like i said if you have a couple to do build the spare engine up and swap good for bad and keeping doing until they are all done. with all parts and fluids you looking at between 500 and 600 per car, this would include a new slave cylinder and front crank seal... You can now get front crank seal off of ebay and good engine builds for about 35 where as only 6 months ago they were dealer only part at 50+ depending on who you went to...
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(Post Link) post #9 of 16 Old 29-06-10 Thread Starter
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I will check again but a company near Guilford regind twinspark cranks with new mains and half bearings for around 80.Ive been recomended to them by my local engineering co who are of good repute.
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Originally Posted by seymour beaver View Post
I will check again but a company near Guilford regind twinspark cranks with new mains and half bearings for around 80.Ive been recomended to them by my local engineering co who are of good repute.
Sounds to cheap to me i know the grind itself is about 68 and then shells on top.
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if crank is out might as well get it balanced if possible send flywheel so they can be balanced as
a pair will result in a very smooth power delivery (balance and match pistons as well) for added fun
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Quote:
Originally Posted by seymour beaver View Post
I will check again but a company near Guilford regind twinspark cranks with new mains and half bearings for around 80.Ive been recomended to them by my local engineering co who are of good repute.
Hi Seymour, I realise it was a while back but did you get this done and if so, who did you use?
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Hi Seymour, I realise it was a while back but did you get this done and if so, who did you use?
These guys seem to have the right gear Southern Rebore Services Crank & Block II
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Yeah I found them, thanks Biffa and they look the business. I just thought I'd find out if Seymour had any sort of recommendation.
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Did this on my old 155 1.8 ts. Had to fit oversized ends. It's worth sticking a set of mains in there too and while the pistons are out hone the bores and put a set of ringsin there. My engine did over 60k before I swapped the whole unit out for a v6 but the bottom end was still strong. Engine needs to be out really. Also the condition of the crank is very important. If it is scored too badly the crank will not be able to be saved as to sort it will remove the tough rided coating. A second hand crank can be picked up from places like autolusso. With ts engines being worthless I can't see it costing that much for a good used one

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Quote:
Originally Posted by Joss View Post
Did this on my old 155 1.8 ts. Had to fit oversized ends. It's worth sticking a set of mains in there too and while the pistons are out hone the bores and put a set of ringsin there. My engine did over 60k before I swapped the whole unit out for a v6 but the bottom end was still strong. Engine needs to be out really. Also the condition of the crank is very important. If it is scored too badly the crank will not be able to be saved as to sort it will remove the tough rided coating. A second hand crank can be picked up from places like autolusso. With ts engines being worthless I can't see it costing that much for a good used one
If you get a regrind they will do the mains as good practice anyway...
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