Needed: 1.25 mm (.050) oversize main bearing set for an early (1970) FJ40 F 3.9 L I6 engine.

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A

Army Dave 2

Joined
Apr 6, 2026
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Spokane Valley, WA
Howdy all,
I've been tasked with finishing someone's unfinished Land Cruiser project...and the reground crank measures out to 1.257 mm under on the main journals. I can see old parts listings (not many...mind you) that do indeed show these size mains were offered...but so far...not any that are currently available. I'm totally a new-be to this Land Cruiser stuff. Am I not looking at the correct parts suppliers...or were these 1.25 mm (.050 in.) oversize main bearings not all that common...? I mess with .050 under mains on Jeep L-134 engines all the time. Maybe the Toyota engineers thought that anything needing over 1 mm under was time for a new crank...? (a luxury sadly...I do not have)
Any help on this would be greatly appreciated!
Thanks!
Army Dave
 
Have you explored the vendors at the top? There is also the classifieds with wanted as well as for sale. There are people that redo cranks back to standard - might be cheaper and faster than finding oversize stuff.

1972
 
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Those are shipped from the Middle East.

Mark's Off Road may have OE ones.

Marks Off Road Home Page

Mark's Off Road, home of the Ruftoys offers new, used, and rebuilt parts and accessories for the FJ40 Toyota Landcruiser. Full service and restoration-quality work available for everything we sell.
marksoffroad.net
 
Spike Strip said:
Those are shipped from the Middle East.

Mark's Off Road may have OE ones.

Marks Off Road Home Page

Mark's Off Road, home of the Ruftoys offers new, used, and rebuilt parts and accessories for the FJ40 Toyota Landcruiser. Full service and restoration-quality work available for everything we sell.
marksoffroad.net
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Thanks for the tag Alf. I have not ever heard of that size bearing, never mind having it in stock. I think I may have .010 and .020 oversized, and that would be about it. Too many good cranks here to worry about cutting more off of an 88#, 4-main behemoth.
 
This pic is from my Toyota microfiche dated Jan. '81. Maybe the part numbers will help with your search. The u/s in the description indicates undersize. Good luck on your quest.

20260407_100846.webp
 
Say everyone...thanks for the help...but I came up with a solution!
I took the original bearing shells to my buddy that does older "babbitt beater" engines...and he's going to pour new material in the old ones and then perfectly machine them to match the undersized crank journals (apparently...he does this all the time...?) for $200 bucks.
I'll keep you posted on how it goes.
Thanks again!
 
Army Dave 2 said:
Say everyone...thanks for the help...but I came up with a solution!
I took the original bearing shells to my buddy that does older "babbitt beater" engines...and he's going to pour new material in the old ones and then perfectly machine them to match the undersized crank journals (apparently...he does this all the time...?) for $200 bucks.
I'll keep you posted on how it goes.
Thanks again!
Click to expand...
WE WANT PICTURES!
 
Army Dave 2 said:
Will do!

And...since he has to line bore the re-babbitted bearings...he said things will be spot on so I'll not need to use any main cap shims. Cool!
Click to expand...
Line boring on these old blocks is SO critical, and so often overlooked. I’m not one to tell a machinist how to do their job, but I have 40 years of experience with rebuilding old Landcruiser engines. I would suggest line boring the block first and THEN casting the babbit so that the bearings have uniform thickness.

To any who find this tech informative, please consider hitting the like button.
 
Aren't the mains all different sizes on the F - a lot of setting up for lineboring x 2? Are Taiho bearings still about?
Watching with interest, my 69 has never been opened up but I am planning a 2f oil pump and pan upgrade, will crack a main out of curiosity.
 
Have been googling madly - I have a set of 50thou under Taiho main bearings, unfortunately they are dowel located instead of tang located, 150000 was the engine number the change occurred. My 69 is up in the 250000s but the tang located mains are still readily available, google Toyota F Taiho main bearings.
Looks like the 2Fs are the same.
 
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