YM336D - Started knocking loud while tilling

[clemsonfor]

another thing i thought of was did you machine the crank? i dont remember reading that. it is possible that if it was done it may have not been machined properly.

yea he got it running. There was a later link to it running. I only watched the failed start but i remember others talking about it running.

 

[Domush]

another thing i thought of was did you machine the crank? i dont remember reading that. it is possible that if it was done it may have not been machined properly.

I didn't remove the engine at all, so the crank is still as is. When I have the bearing out I'll check the crank for roundness on #3. I'm beginning to wonder if it may be slightly out of round, which would be awful news.

 

[Domush]

To everyone who thought I am an idiot... You are so right!

Not sure how it happened, but I somehow managed to mix up the rod caps. The stamped numbers are now different! I'm nearly positive they were matching numbers when I removed them.

I'll be swapping them in a moment to verify. Here's hoping this is the issue.

 

[clemsonfor]

Glad to hear this not for damage sake but hopefullyy this is the cause of your problems and you can bolt it up and go for years to come.

 

[Domush]

That was it!

#1 and #3 caps were mixed up. I swapped them and now they both measure .003"clearance!

Now to button it up and adjust the injector timing

 

[Domush]

And you are 100 thousand % sure the caps are on right.

Winner of the keep asking until he triple checks award goes to car doc!

They were on the right direction, just not on the right rods :-o

By the way, the tabs on the bearings do line up on the same side on these, for future reference.

 

[clemsonfor]

So did you start it up does it run or you just have moved them and putting on the oil plate/cover? Hope there was no damage done by them, on wrong. Did you not say that it just shut off on the test run i hope i dont remember you saying it bound up as you are clearly spinning it over.

Also do you still need to be worried about the uneven wear on the old bearing like CD mentioned?

 

[Domush]

This just isn't meant to be...

I started it up and it immediately blew a head gasket. Huge amounts of pressure built up in the radiator, making the hoses spray coolant and I can see bubbles coming out of the gasket below injector #1.

Head not flat enough? Bolts were torqued to spec. Head only had a .004 variation, which was Max spec, but still in spec.

Bah

I'll post a video later tonight.

 

[kenmac]

did you remove the head & try to use the same gasket ??..

According to the book the specs. are

1 st pass.... 43 ft lbs

2nd pass...87 ft lbs

final pass.... 116- 130 lbs


there is also a tightening sequence in the book

 

[Garybake]

The head was overtemped and warped before you(Oil Sludge). That was clear in your pictures. If it was not machined flat on your tear down, I would not expect a different result. You previously stated that water pump was leaking so I suspect pressure build then(after rebuild). You will need to follow that up (water pump seal) as well head surface so it does not run low on coolant and overheat again. Good Luck!:thumbsup:
Glad you found caps wrong I wondered as you stated they were factory stamped and also stated you marked them on removal... Good Job Car Doc!
Do not get frustrated! You did great under the condiions(weather, underneath tractor, etc.) You will be plowing in no time given your history of effort.