Builds 1985 JDM 3B Engine Rebuild and Other Stories

3B Pistons New OEM

Onur

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Might as well share some more new OEM pics... :)

Pistons: These come as a "standard" size with no sizing due to the fact that the cylinder liners do the work of sizing.

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These are manufactured by ART Pistons for Toyota.... ART is a very long time supplier for Toyota and has always manufactured Land Cruiser pistons for almost all engine variations.

ART used to be a separate entity until they were recently consolidated under the AISIN Group, which is a part of the Toyota Group.



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Onur

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Some more piston porn. :lol:

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Thrust washers: These are the standard size and go in at the # 3 main bearing (so the center main bearing journal). These are manufactured by Taiho for Toyota (Taiho has long been a Toyota supplier and has always provided main bearings, conrod bearings, camshaft bearings and thrust bearings for the Land Cruiser engines):



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3B Engine Internals

Onur

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mongoose2231

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If I'd known at the time that I was going to turbo my truck after the rebuild, I'd have asked that you get me a set of these steel insert pistons dude! Can those still be had from a source somewhere?
Thinking future, that's all..
 

Onur

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That broken main bearing cap is insane.
Agreed. Everyone whom I’ve talked with or shared the picture is amazed at both the cap breaking and the fact that I might have been driving this thing for tens of thousands of miles without even knowing.

Really speaks highly to the robust engine design.
 

Pacer

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Agreed. Everyone whom I’ve talked with or shared the picture is amazed at both the cap breaking and the fact that I might have been driving this thing for tens of thousands of miles without even knowing.

Really speaks highly to the robust engine design.
Can we see a pic of the fracture surface please?
 

Pacer

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On the advice of smarter minds than me, I’ve decided the correct path is to have a machine shop line bore the block with the used #2 bearing cap.
Good call.
Maybe look for (mag flux) other stress in the block, especially around boss #2
 
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The inside corner on the bottom of the cap is a stress riser - but still that's a beefy cap on a 5 main 4 cylinder. Must have happened when you tipped it on it's side :)

Looking at the witness marks on the exterior of the lower shell - it was working against the larger piece of the cap and tho it was flexing it held. Amazing.
 

Onur

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The inside corner on the bottom of the cap is a stress riser - but still that's a beefy cap on a 5 main 4 cylinder. Must have happened when you tipped it on it's side :)

Looking at the witness marks on the exterior of the lower shell - it was working against the larger piece of the cap and tho it was flexing it held. Amazing.
Agreed. Probably occurred during the flop when the engine ran for about another 30-40 seconds.

Just sent some pics of the bearing cap and the main bearing to the machine shop that is going to be doing the line boring and he was amazed how robust things were for the 3B.
 

Onur

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Plan has been set.

1. Interviewed machine shop and they have line boring equipment, work on diesel engines, and have an older guy who has done machine work to Toyota diesels from his time in industrial applications.

2. Machine shop will line bore main caps, do a run out test of crankshaft, and go from there regarding best course of action.

3. Machine shop will press out old cam bearings and install new ones.

4. Machine shop will remove old oil jet and install new ones.

5. Machine shop will press out and install new cylinder liners (if needed-- they have cleaned up pretty impressively with just my home brew flex hone from Amazon.)

Then, I'll clean up, paint, and built out the rest of the engine.

Replacement bearing cap should be here early next week, so parts will go to machine shop next week with a 8-10 day turn around. Gives me plenty of time to clean ancillary parts, prepare garage for block, finish up the head, etc.
 

FJBen

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Plan has been set.

1. Interviewed machine shop and they have line boring equipment, work on diesel engines, and have an older guy who has done machine work to Toyota diesels from his time in industrial applications.

2. Machine shop will line bore main caps, do a run out test of crankshaft, and go from there regarding best course of action.

3. Machine shop will press out old cam bearings and install new ones.

4. Machine shop will remove old oil jet and install new ones.

5. Machine shop will press out and install new cylinder liners (if needed-- they have cleaned up pretty impressively with just my home brew flex hone from Amazon.)

Then, I'll clean up, paint, and built out the rest of the engine.

Replacement bearing cap should be here early next week, so parts will go to machine shop next week with a 8-10 day turn around. Gives me plenty of time to clean ancillary parts, prepare garage for block, finish up the head, etc.
sounds like a good shop. I would make sure and give them the liner protrusion specs so they can check those and see ifnthey need to counterbore or not
 
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