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Say. George

Silver

Well-known member
I've been asking around, searching on the internet etc and I can't find the answer to my question. Then I remembered your a guy that knows about old cat engines.
I have a D6 C (76A) with a d333 engine. The engine is short on power. Can I turn the pump up on this engine to increase the hp? The pump has shims on the back side of the fuel rack rod, is it just a matter of moving one or two from one side to the other or is there a whole bunch more involved?
 

George

Well-known member
Sorry I had not seen the message - - - I will check with my mechanic and see what he says as I don't believe I have that much experience with the fuel systems.

I did have a 3306 that kept having problems and I kept changing the fuel filter for short term limited responce. I then found what looked like a sediment bulb hidden by the water pump - - - it turned out to be a "Pre screen" - - - a stack of brass washers on a rod that the fuel runs thru prior to the filter - - - cleaned them with compressed air and back to full power again.

This is small ( about the size of a spool of thread ) and all steel and had gotten painted to match the engine so it was hard to fgind - - - I now clean it once a year and always takes me about 5 minutes to find it again and I know where it is ( close )

Hope this helps but I will check with Dan and get back.

I will go back to the hospital again on Thursday and they are to remove a 10" row of staples - - - they were to come out last week but they felt I had not healed enough. They put in a mesh patch all they way across then sewed it internally with self desolving thread then glued me together then reinforced the cut with staples. I looks like I gave birth cecerian style! The cut is way down below the hair line so I could still be a nude model HA HA or as my wife would say an old fat example of what no woman would want.

Done in by pumpkins! But my grand daughter and I had a great time - - - I just should had used the skid steer on some of the bigger ones! We had about an acre this year and she and my foster son grossed over $5,000.00 - - - My foster son made enough contacts that they want to do 5 acres this year. And they want to do an acre of watermelons as well - - - I guess they will become truck farmers!
 

George

Well-known member
Just talked to Dan

He said the shims you are talking about are for torque rise and unless they have been moved before you should leave them alone - - - he feels you will have a pre screen much like I discribed but be prepared to search for it as Cat loves to hide them.

If you move shims keep tract of what you are doing so that you can put them back if you see little to no improvemant.

Sorry I could not be of more help.
 

loomixguy

Well-known member
Setting the rack on an old 76A will help some, but they always were a weak sister, IMO.

It ain't a D11, just like all the yahoos here with a diesel pickup think it's a Peterbilt.
 

Silver

Well-known member
Thanks guys, glad you're healing George.

I know these old dozers aren't power houses, but she should be able to spin the tracks in 1st gear. :???: She does make lots of black smoke. I'd like to see less smoke and more power. Seems to me these engines made substantial power in other industrial applications.
 

LazyWP

Well-known member
Has it always made smoke with no power? Maybe not enough air? Don't ya just love people trying to tell you whats wrong 1000 miles away?
 

loomixguy

Well-known member
Silver said:
Thanks guys, glad you're healing George.

I know these old dozers aren't power houses, but she should be able to spin the tracks in 1st gear. :???: She does make lots of black smoke. I'd like to see less smoke and more power. Seems to me these engines made substantial power in other industrial applications.

Excessive black smoke means the fuel is set too rich. An old Bohunk CAT mechanic told my Dad years ago that when working their hardest, those old machines should be putting a slight haze out of the exhaust. That's how he told if the rack was set right. Your results may differ, though.....

Would altitude figure into this in any way, Silver???
 

littlejoe

Well-known member
"Excessive black smoke means the fuel is set too rich. An old Bohunk CAT mechanic told my Dad years ago that when working their hardest, those old machines should be putting a slight haze out of the exhaust. That's how he told if the rack was set right. Your results may differ, though.....

Would altitude figure into this in any way, Silver???"

This tickled me---my dad grew up some in mining towns--'bohunk' 'wops' and 'micks'---and probably others---not as politically uncorrect as todays hypersensitive society might deem, perhaps more of a description/slang

anyhow, yrs ago i had a 335 rebuilt in great falls by a great ol' "bohunk"--this guy started out doing pumps and injectors---then expanded into a few complete overhauls----he'd do some stuff to cummins specs, considered other specs plumb sloppy---i bought this motor well used, it had 380 stamped on the pump but he set everything for a 335. Guys we were running with saw the 380 and said "a ha! knew that had more than a 335 in it!" It'd avg 8 mpg, and that's counting woods roads and loading yourself. And with self loader and pusher axle I was was at least 6,000 # heavier that them.

anyhow, "Babe" said 'turning up a pump' was bull---that pump was just one component and that injectors, turbo and pump should be matched to each other and a planned design on the rest of the engine. Very sweet, honest engine. On a long pull, just the slightest hint of black smoke. "That's unburnt fuel---don't do anybody or anything any good"

I'm wondering if your engines turboed? Or set for your altitude? And what kinda shape your injectors are in? And any restrictions in fuel, air supply? I love old cats---my D7 is a 7M--precedes the 3T---made early 40's---wide open is 'high idle'---turns slow and overbuilt, can't tear itself up---but it will slip tracks in 1st.
 

Silver

Well-known member
The engine is turbocharged, it has smoked since I've owned it. One old cat contractor told me the old 6C's smoked a lot if they revved too high. I turned down the max rpm's on the governor and that cleared up the smoking when I was just walking it down the road.
The altitude is a good question. This dozer came from Houston BC, which I assume is similar in altitude to here.

You know, I have an old 1486 International with a rotary fuel pump on it. I can turn the horsepower up from the stock 145 to nearly 300 just by turning the screw on it.

I think one of these days I will get a mechanic to come set the fuel rack properly on it. There are still a few good old time cat mechanics around, if I'm lucky one will come out for some hunting privileges :D
 

leanin' H

Well-known member
Silver said:
The engine is turbocharged, it has smoked since I've owned it. One old cat contractor told me the old 6C's smoked a lot if they revved too high. I turned down the max rpm's on the governor and that cleared up the smoking when I was just walking it down the road.
The altitude is a good question. This dozer came from Houston BC, which I assume is similar in altitude to here.

You know, I have an old 1486 International with a rotary fuel pump on it. I can turn the horsepower up from the stock 145 to nearly 300 just by turning the screw on it.

I think one of these days I will get a mechanic to come set the fuel rack properly on it. There are still a few good old time cat mechanics around, if I'm lucky one will come out for some hunting privileges :D

Hunting Priviledges!!!! :shock: Need any fence built? Wood cut? Neighbors irritated? I am not much good at anything else, but i'm game to try! :lol:
 

Silver

Well-known member
leanin' H said:
Silver said:
The engine is turbocharged, it has smoked since I've owned it. One old cat contractor told me the old 6C's smoked a lot if they revved too high. I turned down the max rpm's on the governor and that cleared up the smoking when I was just walking it down the road.
The altitude is a good question. This dozer came from Houston BC, which I assume is similar in altitude to here.

You know, I have an old 1486 International with a rotary fuel pump on it. I can turn the horsepower up from the stock 145 to nearly 300 just by turning the screw on it.

I think one of these days I will get a mechanic to come set the fuel rack properly on it. There are still a few good old time cat mechanics around, if I'm lucky one will come out for some hunting privileges :D


Hunting Priviledges!!!! :shock: Need any fence built? Wood cut? Neighbors irritated? I am not much good at anything else, but i'm game to try! :lol:

You already have hunting priviliges. You just gotta get here!
 
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