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Old 12-13-2017, 03:12 PM   #1
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Caterpillar Diesel term

Hi,

Hoping for some clarification on engine terminology regarding Caterpillar engine specifications.

The term is "on engine" or "off engine".

It refers to the measurements for adjusting the injector pump. The difference between to 2 measurements, "on or off" engine is about 0.066".

One measurement indicates injector spacing of 2.009" on engine or 2.156" off engine.

Any help would be appreciated

thank you
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Old 12-13-2017, 09:17 PM   #2
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Can't help except to ask this question on Boatdiesel.com.
The forum Cat expert is Dave.

Hopefully he will see and reply.

It may help though if you said which engine you are referring to specifically.
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Old 12-13-2017, 09:34 PM   #3
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From Bob Lane's 2012 Passagemaker article on Malahide Yachts, the Ursa Major has this:
"375-horsepower Caterpillar D-353TA "
though he does go on to say that a former owner had to re-power her.
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Old 12-13-2017, 10:01 PM   #4
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Caterpillar D-353

This is a Caterpillar d-353

We have just had her rebuilt and are experiencing what seems like overfueling. Fouling injectors...

Plunger depth and injector timing look pretty straightforward, I just need to understand which measurement to go for.

Thanks
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Old 12-14-2017, 05:59 AM   #5
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Malahide
Ditto Dave on boatdiesel. Have you talked to Hatton in Seattle? They are pretty good for steering questions like this. BTW, the half century old designed 353s are absolute gems, good luck.
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Old 12-14-2017, 08:36 AM   #6
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"Off engine" is a bench test or assembly setting. This is the starting adjustment to get you close. Once installed and "On Engine" you will fine tune adjustment based on performance to balance delivery after assembly to the engine.

I'm trying to search but not having much luck finding the service manual in our systems. I'm IM'ing a co-worker now who use to work in Pontiac.

PM me if you need more info.

Thanks,
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Old 12-14-2017, 08:51 AM   #7
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Thankyou!
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