Member Since: 29 Sep 2018
Location: midlands
Posts: 11
Crank snapped again
Evening all happy new year,
looking for some advice befor I go crazy lol cranked snapped last year got a reconditioned crank with right size bearings to suite what the machine company said the crank needed, a so called friend fitted the crank and bearings for me and the rest of engine got put back together. Engine started first time like a dream, was taking a steady drive and engine started making a horrible knocking noise so wasn’t taking any chance got car recovered..
Over the past week iv taken engine out spun it over and stripped sump and extension sump off to find the crank has snapped again
Hoping someone can help me why has this crank now snapped is there a problem with something else gearbox or something
Last edited by madsparky on 12th Jan 2019 7:40 pm. Edited 1 time in total
12th Jan 2019 7:22 pm
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20731
Member Since: 29 Sep 2018
Location: midlands
Posts: 11
Iv managed to get a new block with crank in to rebuild the engine I’m just worried if the gear box could be causing it
12th Jan 2019 9:00 pm
Paul68
Member Since: 01 Mar 2015
Location: Dudley
Posts: 355
Is this a brand new block and crank you have purchased?
12th Jan 2019 11:41 pm
madsparky
Member Since: 29 Sep 2018
Location: midlands
Posts: 11
It’s was off accident damaged car that caught fire I got the engine all the plastics on the top have melted so stripped it all down so can use the block
12th Jan 2019 11:44 pm
lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
Some cranks wont take a regrind.
Seen it on trucks many years ago.
I bet your friend would be dead chuffed to see what you really think of him!
13th Jan 2019 12:06 am
madsparky
Member Since: 29 Sep 2018
Location: midlands
Posts: 11
He’s meant to be a machanic and thinks he knows everything so I trusted what he’s says lol a few people have told me you never change a snapped crank because it bends the pillar blocks 🤔
13th Jan 2019 12:17 am
galwaygreen
Member Since: 30 Oct 2011
Location: plymouth
Posts: 6525
would have thought a crank could be gauged on an engineers block...(clearly by someone who knows wat there doin)
13th Jan 2019 12:24 am
madsparky
Member Since: 29 Sep 2018
Location: midlands
Posts: 11
The company who I got the crank from specialise in re grinding cranks and told me what bearings to get for it main bearing 0.5 and bid ends 0.25 so trust they know what there doing
13th Jan 2019 12:32 am
galwaygreen
Member Since: 30 Oct 2011
Location: plymouth
Posts: 6525
understand that....those sizes would be there whether the the crank is bent or not...my point was ,,,,,,is the crank straight.....I think gauging would tell...……...feel for you...
13th Jan 2019 12:37 am
madsparky
Member Since: 29 Sep 2018
Location: midlands
Posts: 11
I can’t remember we’re i have read it about faulty gearboxes causing the cranks to snap just didn’t want to spend loads of money on rebuilding the engine and it happening again struggle like a idiot getting the engine out without taking the body off 😂
He’s meant to be a machanic and thinks he knows everything so I trusted what he’s says lol a few people have told me you never change a snapped crank because it bends the pillar blocks 🤔
I still shudder at my only full rebuild under the "watchful eye" of a trained mechanic. He specifically told me it was ok to re-use the bolts for the big-ends. It threw a rod as I was going up the M63 Barton Bridge … which was in the days before it got widened to have a proper hard-shoulder. Not a pleasant experience with nowhere safe to stop.
13th Jan 2019 1:13 am
stephenw46
Member Since: 22 Jun 2011
Location: West Midlands
Posts: 1155
I have rebuilt a few engines that have snapped the cranks, and the only way we reused the block was to get them line bored I think was the wording but this was on commercial vehicles a long time ago lol , but out of curiosity did you change the oil pump as well ?
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crank, or the block has been twisted by the original crank snapping
