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Topic: Cracked 3.4t bmc engine (Read 497 times) |
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Richard
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Cracked 3.4t bmc engine
« Thread started on: Nov 6th, 2009, 8:12pm » |
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Ive got a crack in the bottom of my engine block where the liner sits.could allow water to leak into the crankcase.what are my options?also what sizes of undersize big end bearings are avilable for this engine?
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ploughman
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Re: Cracked 3.4t bmc engine
« Reply #1 on: Nov 6th, 2009, 10:33pm » |
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Hi,
Thats bad news I am afraid, your block is scrap, but you may well find a good one if you look in the vintage commercial ads. Same engine in the early FG series trucks. ( the ones with the windows that allow you to check the drivers socks)!
Regards
Harry
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drifter
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Re: Cracked 3.4t bmc engine
« Reply #2 on: Nov 7th, 2009, 01:24am » |
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In the past I have used a company that uses a procedure called Metal Locking. They are able to "stitch" cracks in engine blocks, frames etc. They have done some large slow speed engines for us. (2200 H.P.and above). They drill and tap holes the lenght of the crack and thread bolts overlapping them slightly. We have done this in water jacketed areas and have had no problems. You may be able to research that option.
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powershaft
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Re: Cracked 3.4t bmc engine
« Reply #3 on: Nov 7th, 2009, 9:30pm » |
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Never done one myself, but have spoke to a couple of boys you repaired theres with those metal pastes that you can buy. How much work they done with the tractors afterwards I dont know,if you want more details i,ll find out for you.
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Richard
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Re: Cracked 3.4t bmc engine
« Reply #4 on: Nov 8th, 2009, 1:51pm » |
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Could i fit a 4/98 engine the tractor?i imagine they would be easier to find than an original block.
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spingo
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Re: Cracked 3.4t bmc engine
« Reply #5 on: Nov 8th, 2009, 4:20pm » |
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I have an old BMC Engine in hedgerow condition (Block Might be OK though) but im not sure if its a 3.4 or not. I think it might a 2.2??
All I can find number wise is
Cylinder head- 12B1877 X41
BLOCK - B16K4
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rickcobley
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Re: Cracked 3.4t bmc engine
« Reply #6 on: Nov 8th, 2009, 8:28pm » |
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Hi, I would not have much faith in a block that had a repair near the crank as you described!
The 4/98 will fit but you need a tractor version with crank balancer or it will shake your tractor to bits
( rubber mounted truck engines dont have a balancer).
The only problem area you will have is the bottom hose as your tractor will have water pump inlet to the right of tractor and 98 series have inlet on left side. Youi will have to relocate radiator pipe stub of find very rare thermostat housing for 98 series with right hand bypass hose stub and use tractor water pump on 98 series.
Perhaps best to find good 3.4 block!
Regards Rick Cobley
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ploughman
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Re: Cracked 3.4t bmc engine
« Reply #7 on: Nov 8th, 2009, 9:27pm » |
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Hi,
Further to my earlier post, this happened to my 1042 engine, and the cracks passed through the main bearing housings. I dont think plastic metal would do too good a job there!
Regards,
Harry
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powershaft
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Re: Cracked 3.4t bmc engine
« Reply #8 on: Nov 8th, 2009, 9:59pm » |
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Could not agree with you more,did,nt realise it was cracked through bearings.
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ploughman
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Re: Cracked 3.4t bmc engine
« Reply #10 on: Nov 9th, 2009, 6:35pm » |
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Hi,
Long time since I was there, but I am sure there was a 3.4 engine in Ron Greets yard. Was well stripped and rusty, but the block should have been ok still.
Regards,
Harry
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Richard
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Re: Cracked 3.4t bmc engine
« Reply #11 on: Nov 9th, 2009, 7:23pm » |
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Thanks Rick id spotted that on e bay too.Regarding the 4/98 engine would my flywheel cover bolt to the block and my clutch bolt on to the leyland flywheel? The engineer who took the liners out for me is of the opinion perhaps 7 out of 10 bmc blocks i might find would have similar problems which is why im so keen on using a 4/98.also the big ends on my crankshaft may be too far gone to use 30us shells.
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rickcobley
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Re: Cracked 3.4t bmc engine
« Reply #12 on: Nov 9th, 2009, 8:19pm » |
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Hi, Fit your back plate and flywheel also timing case . It;s not hard.
Regards Rick cobley
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J V P
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Re: Cracked 3.4t bmc engine
« Reply #13 on: Nov 9th, 2009, 8:20pm » |
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Hi all - Can anybody put forward a suggestion as to why engine blocks crack at the bottom right through to the crank bearings? And at the top, through to the top deck.
Is it stress, is it overheating, is it frost or is it just one of these things? I've seen many cracked blocks on a number of different makes of engine and in every case, when the owner was questioned and the engine inspected it was found to be caused by frost damage due to lack of anti-freeze. I worked in tropical Africa in the early '80's and never once saw a cracked block. There were plenty of broken con-rods, crankshafts, sheared flywheel bolts, dropped valves and seized crankshaft bearings.
I know I'm opening a can of worms in starting this discussion, and I'm sure many reasons will be put forward, but since 'Good' blocks are getting very scarce if a genuine reason can be found then more tractors can live on. - JVP
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ploughman
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Re: Cracked 3.4t bmc engine
« Reply #14 on: Nov 9th, 2009, 9:27pm » |
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Hi Everyone,
I am not certain that lack of antifreeze will cause the cracks in the bottom and top of BM C blocks. I have found several frost damaged and bodge repaired blocks( in one case a liberal coating of water pump grease was holding the water in) which were devoid of cracks in these places. I feel that it is more to do with casting quality and seasoning time.
To Return to the 3.4 block, I cant agree with the engineer who stated seven out of ten will be u/s, as this is the only four cyl block I have heard of with this problem. Regarding the fitting of a 498, this will destroy any originality so reducing the value of the tractor. To conclude there are 3.4 blocks out there, and indeed a complete tractor with a loader fitted sold for a price comparable to that involved in the purchase and conversion of the 498 unit.
Regards,
Harry
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