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Old 10-11-2017, 10:44 AM   #1
DanCainey
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Crankshaft Main Bearing Reference Marks

Hey,

I have a TU2J2 that I am fully rebuilding, and I am trying to determine what size main bearings I need. According to the Haynes manual, there should be reference marks on the timing end of the block, and on the right-hand web of no 4 crankpin on the crankshaft. These marks should show as a series of 5 letters, referring to each of the 5 bearing bores/crankshaft journals.

However, I cannot see these marks on either my block or crankshaft.





So I'm a little confused. I've looked all over the block and cant see any marking like what is described in the manual.

Also, the Haynes manual states that early aluminium blocks used three thicknesses of bearing (blue, black and green), and that later aluminium blocks used six different thicknesses. But they don't specify which engines are classed as early or later. Any ideas?
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Old 10-11-2017, 11:47 AM   #2
welshpug
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you need to measure the crank.
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Old 10-11-2017, 02:52 PM   #3
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Like welshpug said. The thing is that the crank journals get used over time, and the original bearing size, that supposed to be stamped on the crank and block, is not the correct size any more. The correct method would be to measure the crank and the block an calculate the thickness you need.

Or you could just buy one size aftermarket ones and check clearance with plastigauge.
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Old 10-11-2017, 05:07 PM   #4
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+1 for plastigauge

Peugeot actually use that in their own workshop/overhaul manuals although I've only got one for a VJY/Z/X engine!

Mine references the colours and still tells you to check them with plastiguage and never to put them in without measuring.
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Old 11-11-2017, 05:06 AM   #5
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Thanks for the replies, plastiguage it is!
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Old 11-11-2017, 09:17 AM   #6
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yes, I'd initially get a standard aftermarket set of bearings and plastigauge them, then if the tolerance isn't quite right you can use some of the oem bearings to sort if if possible, or get a regrind to oversize.
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