Pump Carnage Thread

[yotahed]

Hey Fellas

I figure I have seen some pretty good pump damage and carnage in the time I've been in this field, thought it may be of some interest.
So here we go.

I'll keep it simple with some commentary for each example.
Feel free to ask questions too.


First off,

Here is a 3L pump
I suspect very poor fuel or heavy contamination with gasoline or water, stuck injectors, or a combination of both.
I believe they ran it for awhile like this, until it stopped ...

Cam Disk is destroyed along with the rollers, heavy pieces of steel and alloy through-out the pump
Advance piston has a very deep gouge, along with the bore in the housing to match. Both are trash.

Filter was full of debris.

The pump is almost a write off, except the head and rotor are virtually untouched.

I'll add the rest of the photos tommorow.

 

[OGBeno]

Way cool tech info.

Do you see this type of damage more with rotary pumps or with in-line pumps?

Do you have a recommendation on pump overhaul intervals? (Years, miles, hours, etc)

 

[yotahed]

It's a good Idea to have look if it's a 'new to you' rig.

Filters and fuel quality and using a lubricity additive is really key.

10 years seems to be the lifespan of these JDM Rotaries when half-ass maintained and changed hands ten times...
I see a lot of fresh imports with pump and injector issues. Low km doesn't always mean good condtion.

Ive seen some go 500,000km without being off. So it really comes down to maintenance

 

[yotahed]

Here is an injector nozzle that saw some H2O.

It's amazing how almost perfect the break line is.
I joke that it's a technician training cutaway..

 

[yotahed]

Here is a fellows pump that decided to attempt a Head oring repair in situ....

 

[duncanrm]

Filters and fuel quality and using a lubricity additive is really key.

What lubricity additive do you tend to advise?

 

[yotahed]

"It Won't Start"

 

[yotahed]

What lubricity additive do you tend to advise?

Two-stroke Oil, Stanadyne Lubricity Formula, Non-Synthetic ATF, Marvel Mystery Oil. The usual suspects.

 

[yotahed]

Way cool tech info.

Do you see this type of damage more with rotary pumps or with in-line pumps?

More with rotary, since the entire pump is lubed by the Fuel.
Inlines are insanely reliable, even with Logger Maintenance.

That said, even an inline with poor maintenance can be a mess. i'll find some examples of that.

 

[duncanrm]

Two-stroke Oil, Stanadyne Lubricity Formula, Non-Synthetic ATF, Marvel Mystery Oil. The usual suspects.

Sweet thanks.. I've been adding Two Stroke at 200:1 for years.. Inline pump, no issues yet, might be pointless but it doesn't cost much really.

 

[yotahed]

Here is a thoroughly destroyed plunger from a small inline

 

[yotahed]

Here is the all-too-common 1HDT cam disk wear and pitting from Mr rust.

 

[yotahed]

Common major replacement items.

 

[georgebj60]

Sorry if this is a dumb question. Am I correct in thinking that you guys are recommending adding some oil to the fuel at each fill-up? Similar to a 2-stroke engine, but at a far higher ratio?

I'm running a 2H HJ60.

 

[yotahed]

Sorry if this is a dumb question. Am I correct in thinking that you guys are recommending adding some oil to the fuel at each fill-up? Similar to a 2-stroke engine, but at a far higher ratio?

I'm running a 2H HJ60.

Todays diesel is not as "oily" as it used to be when this stuff was designed. Current Diesel is very 'dry'
Adding a bit of lube to the fuel really helps restore the lubricity to make parts that are in constant moving contact last a lot longer, and operate efficiently.

For example, the needle in a injector nozzle has about a millionth of an inch of clearance. You want that clearance to be well lubricated. The same is true with the pumping Head and Rotor in a rotary pump, and Element (Plunger and Barrel) assembly in an Inline pump.

 

[georgebj60]

Thanks for the reply. Very informative. So one more question - is the 1:200 ratio previously mentioned a reasonable amount of oil to add?

 

[yotahed]

A little over a cup for every 100L is about right. It's not critical to be exact. A little more certainly wont hurt.

 

[georgebj60]

Ok, thank you. I'm going to start doing this, once I get my truck running again that is...

 

[OGBeno]

It's a good Idea to have look if it's a 'new to you' rig.

Filters and fuel quality and using a lubricity additive is really key.

10 years seems to be the lifespan of these JDM Rotaries when half-ass maintained and changed hands ten times...
I see a lot of fresh imports with pump and injector issues. Low km doesn't always mean good condtion.

Ive seen some go 500,000km without being off. So it's really down maintnence

Very good caveats here. I immediately redid my rotary on my 3B when I got it from Japan. It was very low miles, but 30 years old. Totally worth the money IMO. Rebuilt the pump and injectors at the same time.

I've been doing 2-stroke oil for awhile now and it's cheap and easily stored in the truck to throw in on fill-ups.

Thank you much for the very useful information....

 

[Prairie Swamp]

Great thread. I love carnage as long as it's someone else's carnage.

Emissions regs have also required the removal of almost all sulfur from the fuel which has lubricity properties I believe. Add in the fact that these pumps were engineered in the 70's or even earlier when diesel was less thin as the OP said. Hence the 2-stroke oil to help out the pump and injectors.