ACMOC
Login | Register
ACMOC

d47u

Showing 1 to 10 of 10 results
2HIGHTEN
Topic Author
Offline
Send a private message to 2HIGHTEN
Posts: 79
Thank you received: 0
I am working on a d4 that has had a rough life, I just put new valves and ground and fit the seats. This engine had new liners and ring about 900 hours ago and shows no wear in the cylinders. This engine misses on no 2 cylinder, I took the fuel pump apart tonight and reset the lifter height and installed a new injector in no 2 and reassembled everything and fire it up and still a miss on no 2, The only thing left is the precombustion chamber. Has anyone ever seen a precombustion chamber carboned up to the point it will not work right. This engine was ran many hours with a very bad valve in the no 2 cylinder also. Ron Meeder
Please log in or create an account to join the conversation.
Thu, Jul 24, 2008 9:32 AM
Old Magnet
Offline
Send a private message to Old Magnet
Posts: 16,667
Thank you received: 0
No, but I suppose anything is possible.
Try moving the injector pump to another cylinder....may have a bad pump or check valve.
Please log in or create an account to join the conversation.
Thu, Jul 24, 2008 9:41 AM
edb
Offline
Member
Send a private message to edb
Posts: 4,027
Thank you received: 0
Reply to Old Magnet:
No, but I suppose anything is possible.
Try moving the injector pump to another cylinder....may have a bad pump or check valve.
Hi Team,
yes, I have encountered this in an old D8 (D13000) engine being used to pump water. It was the only time though.
The customer sent the fuel pump and injectors for reco. as the engine was down on power.
The pump was ok, but two injectors were atomising poorly.
After reco-ing the injectors the engine did not run much better. After some discussion it was suggested that the pre-com's. be checked and 2 were found to be carboned up to about a pencil dia. hole through the carbon build up.
Cleaning out the chambers worked wonders.
Cheers,
Eddie B.
Please log in or create an account to join the conversation.
Thu, Jul 24, 2008 11:41 AM
2HIGHTEN
Topic Author
Offline
Send a private message to 2HIGHTEN
Posts: 79
Thank you received: 0
Reply to edb:
Hi Team,
yes, I have encountered this in an old D8 (D13000) engine being used to pump water. It was the only time though.
The customer sent the fuel pump and injectors for reco. as the engine was down on power.
The pump was ok, but two injectors were atomising poorly.
After reco-ing the injectors the engine did not run much better. After some discussion it was suggested that the pre-com's. be checked and 2 were found to be carboned up to about a pencil dia. hole through the carbon build up.
Cleaning out the chambers worked wonders.
Cheers,
Eddie B.
Any idea of how to go about cleaning the pre cup of the carbon?
I will be taking this a part in the pm and would like any ones ideas , soapy water disolves diesel carbon but takes time , what else works faster?
Ron Meeder, thanks for now.
Please log in or create an account to join the conversation.
Fri, Jul 25, 2008 10:23 AM
ol Grump
Offline
Send a private message to ol Grump
Posts: 1,077
Thank you received: 0
Reply to 2HIGHTEN:
Any idea of how to go about cleaning the pre cup of the carbon?
I will be taking this a part in the pm and would like any ones ideas , soapy water disolves diesel carbon but takes time , what else works faster?
Ron Meeder, thanks for now.
I've burned the carbon off and out of automotive heads with an oxy-acetylene torch, but as far as how it would work to clean the precom chambers I don't know. If you want to try it, adjust the torch for a slightly oxidizing flame, touch the flame to the inside of the chamber and hit the oxygen lever. Be careful if you try this. .burning bits of carbon will fly all over the place!! Do this ONLY in a place where you might do arc welding or burning due to the possibility of starting a fire!! Also, do NOT keep this going for more than a few seconds or so at a time, letting everything cool back down to body temp between tries. Wear safety glasses plus a face shield, not to mention body protection. Bits of burning carbon will fly about as bad as air-arcing welds.

This method is probably going to be highly controversial. As the precups are steel, heating 'em up too hot in conjunction with the jet of pure oxygen from the torch could burn the chambers themselves. This is why you do NOT keep the burn going for any length of time without letting everything cool off again.

In the case of cleaning the precups, I would try this only in the last case of desperation when all else fails.
Please log in or create an account to join the conversation.
Fri, Jul 25, 2008 8:35 PM
SJ
Offline
Send a private message to SJ
Posts: 1,890
Thank you received: 0
Reply to ol Grump:
I've burned the carbon off and out of automotive heads with an oxy-acetylene torch, but as far as how it would work to clean the precom chambers I don't know. If you want to try it, adjust the torch for a slightly oxidizing flame, touch the flame to the inside of the chamber and hit the oxygen lever. Be careful if you try this. .burning bits of carbon will fly all over the place!! Do this ONLY in a place where you might do arc welding or burning due to the possibility of starting a fire!! Also, do NOT keep this going for more than a few seconds or so at a time, letting everything cool back down to body temp between tries. Wear safety glasses plus a face shield, not to mention body protection. Bits of burning carbon will fly about as bad as air-arcing welds.

This method is probably going to be highly controversial. As the precups are steel, heating 'em up too hot in conjunction with the jet of pure oxygen from the torch could burn the chambers themselves. This is why you do NOT keep the burn going for any length of time without letting everything cool off again.

In the case of cleaning the precups, I would try this only in the last case of desperation when all else fails.
Of all the years I worked on engines I never saw one carboned up to the extent that it caused a miss but why couldn,t you get the right size drill bit and maybe you,d have to extend it out with a piece of rod to reach down in to ream out the hole, just a thought.
Please log in or create an account to join the conversation.
Fri, Jul 25, 2008 8:58 PM
Old Magnet
Offline
Send a private message to Old Magnet
Posts: 16,667
Thank you received: 0
Reply to SJ:
Of all the years I worked on engines I never saw one carboned up to the extent that it caused a miss but why couldn,t you get the right size drill bit and maybe you,d have to extend it out with a piece of rod to reach down in to ream out the hole, just a thought.
Not worth messing with.....just get another chamber....their not that pricey and the fiddle time has got to be worth something😉 😉
Please log in or create an account to join the conversation.
Fri, Jul 25, 2008 10:13 PM
2HIGHTEN
Topic Author
Offline
Send a private message to 2HIGHTEN
Posts: 79
Thank you received: 0
Reply to Old Magnet:
Not worth messing with.....just get another chamber....their not that pricey and the fiddle time has got to be worth something😉 😉
Took things apart again , the precups look about the same on all cylinders so this leads me to think it is in the fuel pumps. swapped number 2 and 3 injectors and it helped some but not perfect . I will price new fuel pumps and a set of injector nozzles on monday unless someone has a set here.
call 716-753-0056
Please log in or create an account to join the conversation.
Sat, Jul 26, 2008 8:36 AM
Old Magnet
Offline
Send a private message to Old Magnet
Posts: 16,667
Thank you received: 0
Reply to 2HIGHTEN:
Took things apart again , the precups look about the same on all cylinders so this leads me to think it is in the fuel pumps. swapped number 2 and 3 injectors and it helped some but not perfect . I will price new fuel pumps and a set of injector nozzles on monday unless someone has a set here.
call 716-753-0056
Before you buy pumps and nozzles, send me a PM....I have a good source for both.
Please log in or create an account to join the conversation.
Sat, Jul 26, 2008 9:01 AM
Glen Hayward
Offline
Send a private message to Glen Hayward
Posts: 47
Thank you received: 0
Reply to Old Magnet:
Before you buy pumps and nozzles, send me a PM....I have a good source for both.
The enemy of carbon is water ! If you soak pistons or in this case pre-cups in water, the water will soften the carbon easier to scrape off ! Or you could try soaking them in a container of Carb Cleaner or take them to a frendly radiator shop. Glen
Please log in or create an account to join the conversation.
Sat, Jul 26, 2008 11:37 AM
D2Dave40
Offline
Send a private message to D2Dave40
Posts: 3
Thank you received: 0
Reply to Glen Hayward:
The enemy of carbon is water ! If you soak pistons or in this case pre-cups in water, the water will soften the carbon easier to scrape off ! Or you could try soaking them in a container of Carb Cleaner or take them to a frendly radiator shop. Glen
A friend of mine swears by oven cleaner and uses it to clean most everything.
Please log in or create an account to join the conversation.
Sat, Jul 26, 2008 6:52 PM
Showing 1 to 10 of 10 results
YouTube Video Placeholder

Follow Us on Social Media

Our channel highlights machines from the earliest Holt and Best track-type tractors, equipment from the start of Caterpillar in 1925, up to units built in the mid-1960s.

Upcoming Events

KORUMBURRA WORKING HORSE & TRACTOR & 100 YEARS OF CAT RALLY

Chapter Nineteen

| 5875 STH GIPPSLAND HWY, NYORA

Booleroo 2025

Chapter Thirty

| Booleroo Centre, 54 Arthur St, Booleroo Centre SA 5482, Australia

CAFES 2025 TULARE, CALIFORNIA

Chapter Fifteen

| Tulare, California

Wheatlands Warracknabeal Easter Rally

Chapter Nineteen

| 34 Henty Hwy, Warracknabeal
View Calendar
ACMOC

Antique Caterpillar
Machinery Owners Club

1115 Madison St NE # 1117
Salem, OR 97301

[email protected]

Terms & Privacy
Website developed by AdCo

Testimonials

"I became a member recently because the wealth of knowledge here is priceless." 
-Chris R

Join Today!