Newly Rebuilt Tractor Overheating

[careyo63]

My Brother and Nephew works for Wally World. Personally hate the place.Only if I have to go there.It's a Fat Lady's Paradice!!I've seen Some???:shocked:Hahaaaaaa!!!!!!

 

[dirtdonkey]

Head was planed when I had valve job done, perfectly flat. I checked the block with straight edge, before assembling and could not see any daylight with flashlight behind the straight edge so I assumed it was flat. The new head gaskets are very iffy compared to the stock solid metal gasket that comes from the factory. I never had overheating problems before installation of the new head gasket. I did the replacement of head gasket twice and it appears both times that was what was causing the overheat. I torqued the bolts per manual and actually cleaned the bolts off and used 5 micron nickel anti seize on them to make sure I had no binding up giving a false reading. That should have resulted in a tighter installation than if they were dry. I was thinking of over tightening but don't know how much is too much so I stayed with 135 ft lbs. I'm just hoping that the gasket holds now or I'm going to try to contact someone in Japan and see if I can get an original gasket from somewhere if I get back to overheating.

 

[kenmac]

I've never used anti seize on head bolts.Only a small amount of oil

 

[careyo63]

The Head Gasket did not come from fredrick's rite next door? Or Hoye?

 

[Car Doc]

I am curious about your block is flat statement because these have wet sleeves and should sit about .005-.006" above the deck. Were they level with each other?

edit: Using a (.002") feeler gage under a good straight edge and pull on it is the best way. I guess light is a measure though whatever works? The liners need to be level w/each other and above deck or they wont crush properly on the fire rings is why I question that.

On blind holes like these moly lube,anti sieze or motor oil all are ok anything is better than dry you have to remember whatever is on the bolts can get in the oil though. (moly can plug a good oil filter and anti-sieze has bits of copper or aluminum so use sparingly) I wonder about a JD gasket? I guess a person could go look at one and compare it couldn't hurt. I know if I have my head off again I wont use a chinese gasket again if I can help it.

 

[HoyeTractor]

The new head gaskets are very iffy compared to the stock solid metal gasket that comes from the factory. I never had overheating problems before installation of the new head gasket.

To be clear- I didn't read all the way through but it does not sound like you are having an overheating issue... just a leaking head gasket issue. All of the temps I saw posted were well below overheating.

I highly doubt that the head gasket is the problem. For one- that is a VERY popular head gasket and this is the first time I can recall anyone having any problems with it. They have been made of the same material for as long as I can remember (at least a decade). The material is not inferior to the original Yanmar gaskets. In fact, I have several original Yanmar gaskets that are still in original Yanmar bags that are made of that same exact fiber material- not metal. You have another problem somewhere.

I didn't read all the way through but are you sure your torque wrench is calibrated correctly?

 

[clemsonfor]

Aaron may have hit on something in that last sentence!

Sure your torque wrench actually put 130lbs on it? maybe it was still a little low and what you think is "overtorqueing" actually puts it in spec?

 

[Car Doc]

1/2-3/4 turn on re-torque at any spec even close is imho the cause of insufficient clamping if clamping is the issue which from the info given sounds like it is. That could be torque wrench, binding threads, stretching bolts (doubtful), incorrect sequence, maybe some other things I am not thinking about...oh not enough protrusion above deck on liners...(still a clamp problem) my .002

He said it has improved after re-torque so maybe its all good now lets hope so. :thumbsup:

 

[RickB]

I suspect a cracked cylinder head.

 

[kenmac]

I suspect a cracked cylinder head.

In a previous thread about this tractor.The best I remember, He had the head checked and some valve work done.