MF 135 In Frame Rebuild Advice

[Masseywrench]

On that motor, is there a blow by hose hooked up to the valve cover or is there another set up to vent it.

I went back and watched the first video and I dont see the hard line running down the side of the block pointing toward the ground. Normally they are on the left side of the tractor. Am I missing something on this?

 

[Gale Hawkins]

Hang in there. As others noted your crankcase is not breathing to pressurize like that.

I am interested in the solution since we have that era Perkins.

 

[Guoseph]

On that motor, is there a blow by hose hooked up to the valve cover or is there another set up to vent it.

I went back and watched the first video and I dont see the hard line running down the side of the block pointing toward the ground. Normally they are on the left side of the tractor. Am I missing something on this?

There is a breather tube, it's on the other side of the tractor from the side I took the videos. I've attached the parts book break out. You can see the tube connect at #70, lower left of the diagram. Then it extends down and there are two versions (see breakout just to the right of the two valves). Mine is the version with #72 down tube, with a little kink in it. It's hard to get a picture/video of it because it's tucked real tight to the engine on the timing cover. In fact it sits behind the pullies and belts so it's a bit hairy to try to stick a camera in there while everything is spinning. I also have my oil catch pan right below this tube and didn't want to risk dropping my camera into the oil :laughing:

As I mentioned, there's smoke and oil coming out of this breather tube, but I have not removed it from the valve cover to clean it out.

View attachment AGCO_651199_82_Page.pdf

 

[Masseywrench]

I understand you are getting oil out of the tube since you have a pan under it. I am wondering if you have a partial restriction other than the kink in the pipe such as a dirt dobbers nest or something like that. I would almost unhook it at the valve cover and hook a piece of hose to it to see if that helps. If it makes your problem go away then you can worry about removing the pipe later. It will be a quick test to let you know.

I dont know what else could be causing this issue - Im going to have to study this one some more.

 

[murphy1244]

Thx.

Something like this?

2-1/2" Dry Utility Pressure Gauge - Blk.Steel 1/4" NPT Center Back Mount 300 PSI:Amazon:Automotive

No, you need a oil pressure gauge.

 

[Guoseph]

I understand you are getting oil out of the tube since you have a pan under it. I am wondering if you have a partial restriction other than the kink in the pipe such as a dirt dobbers nest or something like that. I would almost unhook it at the valve cover and hook a piece of hose to it to see if that helps. If it makes your problem go away then you can worry about removing the pipe later. It will be a quick test to let you know.

I dont know what else could be causing this issue - Im going to have to study this one some more.

I did find one picture of the tube. You can see the bottom of the kink behind the belt. The tube ends right behind that bolt, and you can see the oil it sprays down onto the frame and into my catch pan. I will try rerouting it with a fresh tube into catch bottle, as you can see below it makes quite a mess where it sits now.



Here it is in action. This is again low RPM so smoke is not pronounced. I think I didn't do any videos at high RPM cuz I didn't want to stand next to it and inhale the fumes :licking:

 

[Bladehauler]

just my .02 cents , but I would pull the valve cover and clean the crankcase breather . they get gunked up and wont the the gasses flow out and when they do get restricted they will carry alot of oil out because the pathway has been reduced . shouldn't cost any more the a valve cover gasket and a breather element

 

[Masseywrench]

well there is definitely no restriction in that pipe.

Im going back to my original diagnosis. You have some of the compression rings seized or worn out cylinders.

But I would like to see another oil gauge hooked up and recheck that pressure. I am wondering if something in the oil pump could be causing this issue as well.

I have seen a 393 before with this same style of problem (blowing it out the dipstick and blow by tube worse than yours) and I ended up re-ringing it and doing a hone job and now its like a new motor.
The 393 motor had water in it. Like drove it off in a pond kinda of water. The thing that bothers me about your tractor is that the exhaust pipe is down low and pointing out the back. There is no chance for rain water to get into the head like that unless there is a way it went down the intake some how. Without an avenue for water to be introduced into the motor, it leads me to think its wear. You need to find someone to do a compression test next.

 

[murphy1244]

just my .02 cents , but I would pull the valve cover and clean the crankcase breather . they get gunked up and wont the the gasses flow out and when they do get restricted they will carry alot of oil out because the pathway has been reduced . shouldn't cost any more the a valve cover gasket and a breather element

agree with this. A must do...

 

[Masseywrench]

guys what part are you talking about cleaning under the valve cover. The last video he put up showed plenty of air rolling out of that tube which led me to believe it open.

I looked at the parts book and there is a check valve in the oil pump but I have never had to mess with one of them. Not sure if this could be causing it or not.