Wanted West Kelowna, BC. 13BT crankshaft and harmonic balancer

[Swampman7mm]

Vehicle Model

1. 70 Series

Location

Array

My 1988 BJ74 is sick. The harmonic balancer came loose and destroyed the nose of my crankshaft.
Any help finding one would be greatly appreciated.

 

[lowenbrau]

I used to believe that you could stroke a 13bt using a14b crankshaft and new pistons. I don’t trust my memory anymore so do your own research. It’d be pretty cool to get a couple hundred cc’s of torque of you could

 

[Eurasiaoverland]

I used to believe that you could stroke a 13bt using a14b crankshaft and new pistons. I don’t trust my memory anymore so do your own research. It’d be pretty cool to get a couple hundred cc’s of torque of you could

Not so straightforward. There are two different 13B engine blocks - red block and blue block. The red block is the ancient 3B architecture with cylinder liners and (I believe) smaller main bearings. The blue block 13B is a sort of halfway between the old and new B engine architecture (larger mains but retaining cylinder liners). The 14B is wholly of the new block design (no liners). A 14B crank should fit a blue block 13B, but not a red block 13B block.

My 1988 BJ74 is sick. The harmonic balancer came loose and destroyed the nose of my crankshaft.
Any help finding one would be greatly appreciated.

1988 is the crossover year for 13B-Ts (from 08/1988 build date they are blue block 13B-Ts), so it's not clear what your model will have.

If you have a blue block 13B-T, a blue block 3B (3Bii) crank will fit. I believe a 14B crankshaft will also fit (though will stroke the engine to a 3.7l), and these are still available new AFAIK. Red block 13B-T has the same crank as a red block 3B.

If you have a blue block 13B-T, you can buy new 14B harmonic balancer pulleys which I know will fit (I have a new 14B pulley which fits both my 3Bii and 15B-T).

 

[crawlin cruiser]

I've got a complete running 13bt available in kamloops

 

[Swampman7mm]

I've got a complete running 13bt available in kamloops

What do you want for it?

 

[Swampman7mm]

Not so straightforward. There are two different 13B engine blocks - red block and blue block. The red block is the ancient 3B architecture with cylinder liners and (I believe) smaller main bearings. The blue block 13B is a sort of halfway between the old and new B engine architecture (larger mains but retaining cylinder liners). The 14B is wholly of the new block design (no liners). A 14B crank should fit a blue block 13B, but not a red block 13B block.


1988 is the crossover year for 13B-Ts (from 08/1988 build date they are blue block 13B-Ts), so it's not clear what your model will have.

If you have a blue block 13B-T, a blue block 3B (3Bii) crank will fit. I believe a 14B crankshaft will also fit (though will stroke the engine to a 3.7l), and these are still available new AFAIK. Red block 13B-T has the same crank as a red block 3B.

If you have a blue block 13B-T, you can buy new 14B harmonic balancer pulleys which I know will fit (I have a new 14B pulley which fits both my 3Bii and 15B-T).

Mine is not a blue block.

 

[Swampman7mm]

When I get time to pull the engine, I’ll take the crank and Harmonic Balancer in and see about getting it repaired.

 

[crawlin cruiser]

What do you want for it?

6500kcad

 

[Swampman7mm]

6500kcad

Not the cheapest way to buy a crankshaft

 

[Swampman7mm]

Just an update as to what I did.
Found a good crankshaft in Edmonton. Had it x-rayed, magna-fluxed and polished. Rods and mains were Standard so didn’t need new bearings (only 3000 kms on mine). I believe this was cheaper than having mine repaired.
While that was happening I had Pendozi Machine in Kelowna start machining a new hub for the HB. They bored out the chewed up mess and pressed in a new sleeve and cut the key slot. Once I had the crankshaft in hand they finished the bore to a .003” interference fit and promptly emptied my wallet.
Back at home, I assembled the engine minus the timing cover and oil pan. I could then confirm TDC #1. Now the timing cover and HB went on and I scribed new timing marks on the HB. I had planned on this being necessary and had scribed new and very clear marks on the fuel pump. That done, I’m not opposed to buying a proper 13BT HB if one should appear.
Final assembly was very slow as I had to wait for a new oil pump from Japan.
This all started when I was having charging and overheating issues on a trip in the summer heat. I won’t be able to test it properly till the weather is hot again and also I don’t drive it in salt season.

The pics in order:
1-Out she comes again
2-Shaft measures larger that stock and the keyway is hammered out pretty good.
3-hard to see but the bore is chewed bad and wobbles on the shaft.
4- New crank make it safe and sound.
5- repaired HB. They used some locking goop and 3 set screws to keep things from self adjusting.

 

[Swampman7mm]

Continued:
6- Torqued that bad boy down, with lock tight this time.
7- All buttoned up and ready to go back in.
8- Hopefully we get an early spring and can get out in March for some testing.

 

[Eurasiaoverland]

Nice work. Did you check to see if a later 3Bii/14B HB would fit?

And any idea what caused it to come loose last time?

If the engine had oil in it when you inverted it, I would turn it over by hand a few times before starting it, just to be sure...

 

[Swampman7mm]

Nice work. Did you check to see if a later 3Bii/14B HB would fit?

And any idea what caused it to come loose last time?

If the engine had oil in it when you inverted it, I would turn it over by hand a few times before starting it, just to be sure...

People that know more than me said the later version would likely rub the timing cover.
No idea why it came loose. I had it off during a full rebuild and I am certain I torqued it to spec. during assembly.
I do remember being able to just slide it on and off by hand so that was likely a contributing factor.
And yes, the oil was drained before flipping and tear down.

 

[lynchmob]

Blue block b engines don’t have piston liners

 

[Eurasiaoverland]

Blue block b engines don’t have piston liners

Except in the case of the blue block 13B-T, as I said.

Let me clarify.

B engines launched before 1988 have piston liners, pushrod inspection galleries (and covers), solid lifters, 6 bolt flywheels and vacuum pumps on the alternators. These engines are the B, 2B, 3B, 11B, 13B and 13B-T. Some of these are painted red, others grey or black. The 13B-T is red.

In August 1988 Toyota launched a number of redeisnged B engines which have monoblocks (no liners), no pushrod inspection windows, roller lifters, 8 bolt flywheels and onboard gear-driven vaccum pumps. The cam bearings and I think main bearings are slightly increased in size compared to the older generation. The redesigned engines could informally be called the Bii, 3Bii and 11Bii, though Toyota just call them the B, 3B and 11B still, despite the redesign. They also launched the 14B which additionally has an onboard steering pump, later fitted to the 3B in 1995. In the case of the 3Bii and 14B (which were the same block casting), the blocks are blue. The Bii and 11Bii are black. These engines all had rotary fuel injection pumps, never in-line pumps.

The 13B-T, as I said in my post, was an excpetion. A blue block 13B-T made after 1988 might be painted blue, but you can see that it has no onboard vacuum pump and retains pushrod inspection galleries, and an in-line pump. I assume Toyota did this becasue they were soon phasing out the 13B engine (last made December 1989). They also retain cylinder liners. You can see these in the following thread: Builds - 1988 BJ74 “Number 1” - https://forum.ih8mud.com/threads/1988-bj74-number-1.1087702/ I think the only changes in the blue-block 13B-T are the larger camshaft and crankshaft bearings, and an 8 bolt flywheel.

Later B engines, the 14B-T, 15B* and 4B were all monoblocks of the later design, though some 15B-FTs for some reason got in-line pumps again.