2H sleeves or no sleeves????

[Justcruzin]

Hi all.

Haven't been posting here in a while. But was still lurking anyway...

I had a compression test done on my 2H (that has "only" 234,000 kms on it) and wasn't impressed by the numbers. Cylinder No3 has 284 while the others range between 310 and 340. Not very impresssive numbers IMO.

Not sure what maybe the issue with No3 but I'm seriously looking at rebuilding the engine and I was wondering if those 2H engines (mine is from Australia) do or do not have cylinder sleeves. I've heard that the 2H used in fork lift trucks DID have sleeves while the engines used in Land Cruisers DID NOT.

But, according to my shop manual, the engines used in HJ 47s and HJ60s ALSO HAD sleeves...

Are some models/years/countries using one type of engine while others use the other type??

Could someone please help me on this?

Appreciate your input. Thx.

 

[lostmarbles]

Hi all.

Haven't been posting here in a while. But was still lurking anyway...

I had a compression test done on my 2H (that has "only" 234,000 kms on it) and wasn't impressed by the numbers. Cylinder No3 has 284 while the others range between 310 and 340. Not very impresssive numbers IMO.

Not sure what maybe the issue with No3 but I'm seriously looking at rebuilding the engine and I was wondering if those 2H engines (mine is from Australia) do or do not have cylinder sleeves. I've heard that the 2H used in fork lift trucks DID have sleeves while the engines used in Land Cruisers DID NOT.

But, according to my shop manual, the engines used in HJ 47s and HJ60s ALSO HAD sleeves...

Are some models/years/countries using one type of engine while others use the other type??

Could someone please help me on this?

Appreciate your input. Thx.

Nov 1984 was the change from sleeved to sleeveless for the 2H I believe. (Independent of country and independent of application)

 

[Justcruzin]

Cyl No3 compression reading should have read 240 instead of 284. There is à full 100# difference between the best and worst cylinders .

 

[Justcruzin]

Thx LM. That explains it then as mine is an 83 while the fellows I was referring to own 86s.

 

[Henry James the 47th]

These assumptions hold true if the 2H in your truck is original and not a replacement. Mine was supposed to have the early sleeved motor, but when I found issues and pulled the cylinder head off I discovered it was the later type parent-bored block. I would suggest, therefore, that you pull the head and double check to confirm before committing to purchase a rebuild kit or gasket set.

 

[ozwallaby]

These assumptions hold true if the 2H in your truck is original and not a replacement. Mine was supposed to have the early sleeved motor, but when I found issues and pulled the cylinder head off I discovered it was the later type parent-bored block. I would suggest, therefore, that you pull the head and double check to confirm before committing to purchase a rebuild kit or gasket set.

Is there any way to check via engine number or some giveaway external difference that you know of to signify sleeve or not... Could be very handy info for the 2H masses, myself included.

 

[Justcruzin]

These assumptions hold true if the 2H in your truck is original and not a replacement. Mine was supposed to have the early sleeved motor, but when I found issues and pulled the cylinder head off I discovered it was the later type parent-bored block. I would suggest, therefore, that you pull the head and double check to confirm before committing to purchase a rebuild kit or gasket set.

Good point HJ.

I'm supposedly the second owner of this truck and I DO have the shop manuals that came with tons of notes from the P.O. written in them. I know when the tires, oil and filters and tie rods etc, were replaced but nowhere does it say anything about engine issues let alone engine replacement...

In relation to what Ozwallaby mentions, there's most probably a serial number on the engine that should match the frame number, right?

That said, i agree that it's always best to lift the head and make sure of what you have on hand before ordering parts for it.

 

[Henry James the 47th]

Is there any way to check via engine number or some giveaway external difference that you know of to signify sleeve or not... Could be very handy info for the 2H masses, myself included.

There is of course a serial number on the side of the block, but no Toyota engine serial number list has ever surfaced as far as I know so it is of limited usefulness and cannot be used when ordering parts..

There is also a difference between early and late 2H engines in the water cooling jacket.

 

[Justcruzin]

There is also a difference between early and late 2H engines in the water cooling jacket.[/QUOTE]

Would you say the late model engines would have better cooling capacity then?

Just wondering if the newer 2Hs would be more turbo inclined then the earlier ones as I'm trying to figure out what caused this loss of compression in cyl. No3 in the first place.

 

[Tapage]

another point is if your cylinder walls require some machine work .. you can still use standard piston / rings adding sleeves ..

Edit: there are also 2 gasket numbers for sleeves and sleeveless ..

 

[Henry James the 47th]

Would you say the late model engines would have better cooling capacity then?

Just wondering if the newer 2Hs would be more turbo inclined then the earlier ones as I'm trying to figure out what caused this loss of compression in cyl. No3 in the first place.

No, I wouldn't say there is necessarily a difference in cooling capacity between the two jackets. Toyota could have revised the part for any number of reasons.

 

[Davaa]

Adding sleeves to sleeveless 2H

another point is if your cylinder walls require some machine work .. you can still use standard piston / rings adding sleeves ..

Edit: there are also 2 gasket numbers for sleeves and sleeveless ..

Hey Tapage,

Assuming you have done this to your 2H engine. Could you please give you opinion about adding sleeves to sleeveless engine. I am planning to rebuild a 2h from a 1987 HJ60 which I think is a sleeveless engine. Finding a machine shop that can machine the block cylinders for oversize pistons is really hard here in Mongolia, but there couple of places saying that they can fit sleeves to sleeveless block. My thinking is adding sleeves require less precision machining.

Thanks in advance.

 

[Tapage]

My thinking is adding sleeves require less precision machining.

that would be my thought too .. altho I'm not by any means machining expert ..

I did put sleeves in a 2H that was late model ( here late models post 85 are sleeveless .. ) instead of oversize pistons .. with the matching head gasket and proper machining process you should have no problems ..

 

[Jan-78FJ40]

Hey Tapage,

My thinking is adding sleeves require less precision machining.

I disagree with this. First, to get the sleeve in, the block has to be bored precisely to receive the sleeves. Then the block has to be brought to the correct temperature that allows the sleeves to be pressed in, hold when it is cooled down and not crush the sleeve. Then the block has to be decked.
Sleeves are usually not finished to a piston size, but 0.5mm thicker than what the piston requires, so sleeves have to be bored and honed to accept the piston precisely. If the shop cannot go 0.5mm over the standard bore and be precise about it, they cannot deal with a sleeving process precisely either.

I unfortunately know too much about that, from having had to sleeve a few blocks recently...

cheers,
jan

 

[Henry James the 47th]

Word.

 

[Gary Vansleve]

Is there any way to check via engine number or some giveaway external difference that you know of to signify sleeve or not... Could be very handy info for the 2H masses, myself included.

Timing gear covers are different between sleeved and parent bore motors

 

[himhj60]

This is my late 2H