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Ed's 77 Terex 72-41

kshansen

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11,129
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Central New York, USA
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Retired Mechanic in Stone Quarry
Sounds odd, is there a bad exhaust leak on one cylinder? I agree might be time to pull valve cover and see if there is something not right in there with the injectors. Forget if you mentioned what engine we are dealing with being a Terex I'm assuming Detroit a 71 or 53 series?

I've been busy trying to fix brakes on a Michigan in Minn! Along with some other machines.
 

mountainguyed67

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Jun 4, 2017
Messages
594
Location
Fresno, California, USA
Sounds odd, is there a bad exhaust leak on one cylinder? I agree might be time to pull valve cover and see if there is something not right in there with the injectors. Forget if you mentioned what engine we are dealing with being a Terex I'm assuming Detroit a 71 or 53 series?

I've been busy trying to fix brakes on a Michigan in Minn! Along with some other machines.

It does sound odd, it’s a new sound that came with the low power.

I’m not aware of an exhaust leak. When it leaked before it was obvious, you could see it coming out from under the engine cover sheet metal. I don’t see that now.

4-71 engine.

I don’t have engine manuals, I’m about to order them.
 

kshansen

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Messages
11,129
Location
Central New York, USA
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Retired Mechanic in Stone Quarry
How easy to drop the exhaust manifold off the engine on that machine? I'd be tempted to see if it was blowing smoke out of one cylinder.

Another idea is to feel for heat on each port of the manifold while it is running to see if one is staying cold while the other three start to get warm. Just to get an idea of where to start looking. Then clean around the valve cover good and remove it and just look at things.

Maybe post a picture or two if something looks strange. If possible have someone turn engine over by hand while you watch things like rocker arms moving up and down. Many things I know I or someone else here would see right off just by looking but might be hard to describe in text form here. Main thing are all rockers moving about the same amount, do injector plunger go up and down the same amount, and do things just plain look right from one cylinder to the next.

Do you know if this is a four valve head engine or two valve head, assuming it's a four valve so look for a valve bridge out of place. If you don't know what a valve bridge is it is a piece that sets on top of two valves the the rocker arm pushes down on to move two valves at the same time.

I don't have an Inline service manual handy but most of what you need to know would be in a V-71 manual, I do have an Inline parts book so I could post some pictures if that would help.
 

kshansen

Senior Member
Joined
Mar 11, 2012
Messages
11,129
Location
Central New York, USA
Occupation
Retired Mechanic in Stone Quarry
Guess I spent too much time with 12's and 16's is why I like to narrow it down to one cylinder, with a inline four there's not that many options.
So unless manifold is easier than V.C. I might reach of the V.C.
The rack can stick and cause a runaway, but the plunger can stick down and cause a no-fuel condition on that one cylinder. The rocker arm will have gross clearance if that happens.
Actually if there is any clearance between an injector plunger and rocker arm there is a problem with the injector!

And I try to never say never because a machine will always slip one past you when you are not watching!
 

mountainguyed67

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Messages
594
Location
Fresno, California, USA
Guess I spent too much time with 12's and 16's is why I like to narrow it down to one cylinder, with a inline four there's not that many options.
So unless manifold is easier than V.C. I might reach of the V.C.

Actually if there is any clearance between an injector plunger and rocker arm there is a problem with the injector!

And I try to never say never because a machine will always slip one past you when you are not watching!

Exhaust manifold would be easy to remove compared to valve cover.
 

mountainguyed67

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Jun 4, 2017
Messages
594
Location
Fresno, California, USA
I got a diverter valve, and looked into where it’ll need to go. I know which hoses need to go where, I need to mount it and take measurements for hoses to be made. I plan on using a momentary foot switch, and then the dump lever will clamp and unclamp the logs. Pushing forward to clamp.

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mountainguyed67

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Jun 4, 2017
Messages
594
Location
Fresno, California, USA
I have an equipment dealer service manager friend saying to make hoses all the way out. Mine has the clamp blocks like in the picture, but no tubes. I would need separate hoses with elbow fittings to make the same routing. Then what? Wire the hose to the clamp blocks to keep it secure? The clamp block corners would dig into the hoses eventually. I posed the same questions to him, no response yet. I like the cleanness and secure, durable fastening of the tubing. I know it’s not as straight forward to accomplish though. The hoses hanging down in this picture are for forklift side shift, best I can tell.

36257E45-3742-4FE2-9CDE-13AC7947520F.jpeg
 

mountainguyed67

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Joined
Jun 4, 2017
Messages
594
Location
Fresno, California, USA
I brought the grapple hoses down to have them replaced. I noticed they are smaller from loader to the pipe T (7/8” wrench) than they are from T to the cylinders (1-1/8” wrench). Is that normal?
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