3000 diesel pistons

IHSMOKE

Member
Overhaul a 3000 changed pistons in moter now it does not crank as well as I like parts supplier says that the parts he sent are correct replacements ..tractor had part number C5nn6110j I replaced using d6nn6108l tractor runs but does not start well cold compression height of pistons are the same .I had injection pump off overhauled and injectors rebuilt....next ? Is with the pump off can the pump gear be moved a tooth and be out of time one tooth?
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They used the Simms in-line pump and the CAV rotary pump at different times during the production run of the 3000.

The CAV rotary pump uses a dowel on the front that goes into a hole on the drive gear so it cannot go out of time by simply removing the pump and reinstalling it, other than the slight amount that you can adjust it by rotating the pump body once it is reinstalled. If you made sure that the external timing marks were aligned the same when you put it back on then it should be at the same timing as it was before.

The same is not true for the Simms in-line pump. If you have one of those then you should have followed the instructions in the service manual to get it to TDC on the compression stroke for the number one cylinder before you removed it, as that is what it should have been setup for by whoever overhauled the pump. Also, you shouldn't have turned the engine at any time that the pump was off of the tractor.
 
You're a little off on the inline pump instructions. First off, those are not timed at TDC compression, nor are they locked
there at the pump shop like some other types of injection pumps.

Your last comment has me the most curious. How is one supposed to overhaul their engine if they can't rotate it while the pump
is off?
 
How are you gauging the compression height? Did you lock the two of them together using the same piston pin?

If that checks out, the bowls are different shape. Makes me wonder if they have the same volume. Do you have a burette you can compare volumes with?

Were the head gaskets the same thickness? Did you have the cylinder head rebuilt? Was the valve recession within spec?
 
I think the piston bowls need to be compared for cc volume as Bern said. Diesel compression heat is VERY critical on diesel engines, just 2 or 3 cc increase makes a world of difference on how engine starts cold. Also, did the cylinder head have new seats installed, or just have valves and seats re-ground? Valves MAY be recessed too much, which KILLS compression heat needed for cold starting.
 

He said on his Facebook statement that it had 375 psi compression, not the best for a fresh engine but enough that it should run ok.
He also said it was popping which sounds more like a timing issue.
 
My next ? Is can the gear come out of mesh
with the other gears inside the
cover...should they stay in correct time?
 
Okay maybe I need to clarify some things here...tractor came to me after sitting for awhile...was told to get it running. Crankcase was full of diesel fuel and fuel tank empty ...this tractor been in same family since new never been overhauled..as owners can prove to me ..bearings I took out where orginal...the first thing I did was pull the pump off and injectors out sent off to be reconditioned..when I got then back I tried to crank the tractor...it was a NO DEAL So I checked compression in it needed bunch of help as one cylinder had 0 lbs of compression an the other two was like 120 to 130 psi ...done a leak down on it and had lots of blow by into crankcase ..tore engine down at this time and found bad valves and minor scouring of pistons on the skirts ..so I replaced pistons, rings , bearings, had head repaired....owner comes by and found out tractor had been run hott .. my belief is it lost tension in the rings then ..after all this has been done it will crank and run but it not to my satisfaction..it does have a pop at high rpm .. and I have the timing advanced as far as it will go ..so my next ? Is can the gear jump a tooth inside the cover ? While the pumps off ..
 
What injection pump do you have, an inline or a rotary? Inlines can be spill timed to verify actual timing.

Timing gears cannot jump time once they're inside the cover. Assuming you lined up all the dots, all should be OK there.
 

Question I asked there was could the timing advance be installed backwards on a CAV pump.
Years ago I had a 871 I did a fresh rebuild on along with having the pump and injectors rebuilt, the tractor acted like it was out of time and we couldn't advance it enough to make it run right or stop popping at high rpm's
After checking everything we could think of we threw another pump on and it ran fine, sent the pump back to the rebuilder and they said nothing was wrong with it but it still wouldn't run with that pump. For s&g's we swapped the timing advance from other pump and it ran fine so we took both advances apart and found the rebuilt pump had the timing advance components assembled backwards throwing the pump out of time.
Not sure if that can be done on a CAV or not.
 
The CAV DPA advance piston can be put in backward, BUT pump won't pass the calibration test when in backward. I've used my advance gage with pumps still on engine to
verify advance is working, but it can't be done on Ford applications as the test gage plug is next to engine block.
 
I inframe overhauled this tractor I have not had the front cover off .just small access cover to remove pump just trying to get my bases covered as I thought that the gear could not come out of mesh once in the cover .. it's a CAV pump btw
 
It didn't, technically. Either it was not tested after repair OR test bench operator was asleep. Some Stanadyne/Roosa housings are drilled for both CW and CCW rotation,
and some are only drilled for one rotation. If the housing was drilled for both, and power piston/spring piston swapped into wrong side advance would still move, but pump
would have speed RETARD instead of advance, and that may have happened if operator was not paying attention. If the housing had one drill passage, and pistons swapped the
advance would not move at all.
 
(quoted from post at 19:42:10 01/11/21) I inframe overhauled this tractor I have not had the front cover off .just small access cover to remove pump just trying to get my bases covered as I thought that the gear could not come out of mesh once in the cover .. it's a CAV pump btw

Digging up old thread. Have a 4.2 diesel I'm 555d hoe..high rpm sputter pop. Timing advance seems to not be working. Pull cap off advance cover and can push on the piston so it's moving..can't verify the other side since it's against block. Pulled the head locater bolt out and check ball. All clean and clear. Also latch valve is free and moving. What else besides the transfer pressure issue can cause it to not operate? Has to be pressure issue in the circuit to make the piston not move right? Any help appreciated. [email protected]
 

Start a new thread about your issue
Many users on this forum use classic view that doesn t bring old threads back up to be seen
Very few classic viewers will search back enough pages to see a thread that s over a year old
Modern view does bring up old threads that have new post but classic doesn t
 
(quoted from post at 11:52:43 03/01/23)
Start a new thread about your issue
Many users on this forum use classic view that doesn t bring old threads back up to be seen
Very few classic viewers will search back enough pages to see a thread that s over a year old
Modern view does bring up old threads that have new post but classic doesn t
on't mean to disturb, as I am not a real diesel man, but could this be related to his problem?
1qh3qVe.jpg
ost at 11:52:43 03/01/23)
 
(quoted from post at 08:52:43 03/01/23)
Start a new thread about your issue
Many users on this forum use classic view that doesn t bring old threads back up to be seen
Very few classic viewers will search back enough pages to see a thread that s over a year old
Modern view does bring up old threads that have new post but classic doesn t

Solved. The transfer pressure regulator was in backwards from prev owner. It's sticky as well. Cleaned it up best I can but ran it after clean up and is way better. Thanks
 

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