TUB44 Rebuild or B44 "Hybrid"?

NismoGT · #1 12-15-2015, 09:05 AM

First of all, this is my first post. Glad to join the community and seems like there is a lot of knowledge here. Thanks for any help in advance.

Here is the deal guys, I bought a 01 X5 M62TU without getting to physically look at it (I know, scary right??). Turns out, like all M62 engines, the timing chain guides are destroyed. It ran/idles really rough. Would not really rev and misfires when trying. Dies about 30-45 seconds after running. And sounds horrible (most likely due to the chain guides). Lower oil pan was dropped and the valve guides are in pieces and the oil looks like there is glitter in it.

In my impulsive nature, I ran out to the junkyard and found a 5 series that was DRIVEN in to the yard and pulled it. The oil looked good. Both good indicators. However, this engine is a non-vanos (M62B44).

My question to you guys would be, what do you think I should do? Just refresh the TUB44 (all gaskets, timing chain and guides, s. plugs, etc.) granted the valves have not stuck the pistons. Or get the vanos heads rebuilt and slap them on the B44 (with the electronic throttle body and intake of course)?

I haven't done anything to either engine except drop that oil pan.

Thanks again guys. This is my first BMW. Hope it doesnt like a salty taste in my mouth.

Terrell B.
Baltimore Area

X53Jay4.8is · #2 12-15-2015, 10:37 AM

Quote:

Originally Posted by NismoGT

First of all, this is my first post. Glad to join the community and seems like there is a lot of knowledge here. Thanks for any help in advance.

Here is the deal guys, I bought a 01 X5 M62TU without getting to physically look at it (I know, scary right??). Turns out, like all M62 engines, the timing chain guides are destroyed. It ran/idles really rough. Would not really rev and misfires when trying. Dies about 30-45 seconds after running. And sounds horrible (most likely due to the chain guides). Lower oil pan was dropped and the valve guides are in pieces and the oil looks like there is glitter in it.

In my impulsive nature, I ran out to the junkyard and found a 5 series that was DRIVEN in to the yard and pulled it. The oil looked good. Both good indicators. However, this engine is a non-vanos (M62B44).

My question to you guys would be, what do you think I should do? Just refresh the TUB44 (all gaskets, timing chain and guides, s. plugs, etc.) granted the valves have not stuck the pistons. Or get the vanos heads rebuilt and slap them on the B44 (with the electronic throttle body and intake of course)?

I haven't done anything to either engine except drop that oil pan.

Thanks again guys. This is my first BMW. Hope it doesnt like a salty taste in my mouth.

Terrell B.
Baltimore Area

The Non Vanos M62B44 engine is a tank and far more reliable than the vanos equipped vehicles. They also have the better intake system.

NismoGT · #3 12-15-2015, 04:21 PM

Quote:

Originally Posted by X53Jay4.8is

The Non Vanos M62B44 engine is a tank and far more reliable than the vanos equipped vehicles. They also have the better intake system.

Yea but I would have to source all the electronics for the B44. At least, from what I have been reading about VANOS, is that the solenoids are the main culprit a lot of times. I'm just trying to get this truck back on the road and not kill my bank account in the process.

I'm thinking about just replacing the timing chain system and some VANOS parts and seeing where that gets me. Hopefully that fixes a majority of the issues.

I'm making an educated guess, I would imagine a loose chain/old tensioner can cause the engine to run like poo because the timing would be inconsistent. Correct assumption?

Helihover · #4 12-15-2015, 05:44 PM

Not sure a loose chain would cause that....

Sounds like the chain all ready skipped a tooth or so on the cam sprocket. That's my guess anyway.

I would be concerned with whether or not the valves are bent.

X53Jay4.8is · #5 12-16-2015, 11:37 AM

Quote:

Originally Posted by Helihover

Not sure a loose chain would cause that....

Sounds like the chain all ready skipped a tooth or so on the cam sprocket. That's my guess anyway.

I would be concerned with whether or not the valves are bent.

With you on the bent valves. If thats the case then he is going to spend a fair deal of money to fix it right anyway

NismoGT · #6 12-16-2015, 11:51 AM

Quote:

Originally Posted by X53Jay4.8is

With you on the bent valves. If thats the case then he is going to spend a fair deal of money to fix it right anyway

I'm sure the previous owner kept driving it around with the racket under the hood for a bit, it is possible that there are bent valves. The only way to know for sure is to take the heads off. However I would like to avoid that. I run the risk of damaging the valves (if they aren't already) by doing a compression test. But at this point, I am ready to just say eff it and just do the compression test. Maybe do it with the timing chain cover off and manually put tension on the chain...idk about that though.

diyanich · #7 12-15-2015, 05:55 PM

Hey,

Did it still have oil pressure before you started dismantling it?
That glitter thing is more from the aluminum U-guide and the timing cover( see the attached picture of the one from my X)
I would get a simple compression test on all the cylinders and if it shows good numbers go ahead and replace just the stuff is broken on the old engine.
It's the way I did with mine. Two years and 9000 kms later I only have a timing over advanced for both banks,which is a camshaft sensor wheel misalignment thing.Other than that.Runs as strong as a tank.

NismoGT · #8 12-15-2015, 06:41 PM

Quote:

Originally Posted by Helihover

Not sure a loose chain would cause that....

Sounds like the chain all ready skipped a tooth or so on the cam sprocket. That's my guess anyway.

I would be concerned with whether or not the valves are bent.

That is what concerns me now. I dont really want to pull the heads and replace valves.

Quote:

Originally Posted by diyanich

Hey,

Did it still have oil pressure before you started dismantling it?
That glitter thing is more from the aluminum U-guide and the timing cover( see the attached picture of the one from my X)
I would get a simple compression test on all the cylinders and if it shows good numbers go ahead and replace just the stuff is broken on the old engine.
It's the way I did with mine. Two years and 9000 kms later I only have a timing over advanced for both banks,which is a camshaft sensor wheel misalignment thing.Other than that.Runs as strong as a tank.

I did not perform a compression test yet. Can I still perform one with the lower oil pan dropped and get accurate numbers? It would be a blessing if I only had to do the timing chain, maybe VANOS refresh and other regular maintenance stuff.