Torque Spec for Yanmar Injectors? - SailNet Community
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post #1 of 19 Old 04-20-2019 Thread Starter
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Torque Spec for Yanmar Injectors?

We just had our injectors re-built and I'm getting ready to re-install them on our 4JHE. I have not been able to find the specs in the manual.... should I just snug them down? Having them rebuilt was not cheap, so I don't want to guess.

The injectors are held in place by a metal hold-down with two holes for studs that pass through. There are two nuts that you tighten down on.

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Re: Torque Spec for Yanmar Injectors?

I'm guessing that is the same as my 4JH2E which also uses a metal retainer with two studs. My manual quotes 4-4.5 kg-m (28.9-32.5 ft-ib)

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Re: Torque Spec for Yanmar Injectors?

As also quoted in the 4JHE manual page 3-40

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Re: Torque Spec for Yanmar Injectors?

Do you have a new "crush washer" for each injector? Each time this was done on our former diesel, this was required. Not particularly expensive, but they are a single use item.

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Re: Torque Spec for Yanmar Injectors?

That sounds like the spec for the nozzle nut... isn't that different from the two hold-down nuts?
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Re: Torque Spec for Yanmar Injectors?

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Originally Posted by glossa View Post
That sounds like the spec for the nozzle nut... isn't that different from the two hold-down nuts?
OOOOOOOPS!!

You sir, are quite correct...
Nozzle Nut Tightening Torque 4.0-4.5 kg m ( 28.9-32.5 ft lbs)
Nozzle Retainer Tightening Torque 2.0-3.0 kg m ( 14.5-21.7 ft lbs)

My apologies to the OP. If I remember correctly, they are 10mm, so with steel studs and nuts in a cast iron head, and holding a steel retainer which bottoms against the head, probably just fine.

Now, I wonder which number I used when I reassembled my cylinder head.

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Re: Torque Spec for Yanmar Injectors?

No worries; I ended up using different specs but now I have a new problem; the engine doesn't rev past about 1400 RPM when in gear. When out of gear, it seems to rev up fine. I'm researching to see if this is a common problem. My gut says it's not getting enough fuel. Come to think of it, our diesel heater has been frequently losing its prime; it draws fuel from the Racor.

My last resort is to call my father-in-law. He's a tugboat mechanic.

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Re: Torque Spec for Yanmar Injectors?

Your gut is correct. When throttling up and requesting more torque, the engine responds by injecting more fuel. When was the last time you replaced the Racor? Do you have a lift pump between the fuel tank and fuel filter?
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Re: Torque Spec for Yanmar Injectors?

I replaced both filters about a month ago. We do have a lift pump. I'm starting to think that the in-tank strainer is the culprit; it's the only thing in common between the engine and the heater system. Over the winter, we ran the tank pretty low using the furnace, so it might have been exposed to air and gotten gummed up. I just topped off the tank so I'm hoping there is an easy way to lift it out of the tank.
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Re: Torque Spec for Yanmar Injectors?

If you suspect the feed from the tank may be partly blocked, a quick check would be to feed the engine from another source. If your Catalina 42 is the same a mine, you have a small inspection door just inside the starboard aft cabin. A can of diesel secured on the cabin floor and a feed line would enable you to test the entire fuel system from the engine mounted filter on. Maybe just disconnect the line from your Racor and drop the end into the can. One good thing about Yanmars is how easy they are to bleed.

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