1996 jcb 526 getting diesel into engine oil?

D C

Member
Location
Endmoor cumbria
Ive a 1996 jcb getting diesel in its engine oil, ive changed the lift pump and its no better. Its a perkins engine. Any thoughts what it will be?
 

ACEngineering

Member
Location
Oxon
Heater plug?
Possible but unlikely. It'll smoke well for £10 quid or so you could try it but I have only seen this problem once made worse by a blown boost diaphragm so fuel tank was pressured but turbo so when stopped it flooded the turbo with fuel!
 

ACEngineering

Member
Location
Oxon
I was thinking that. Is it an easy fix or pump away job?
I think its a strip down of pump as seal fits from the inside I think. They do on later machines anyway but I could be wrong on an old one.
Taking it of is easy enough.
Move or take rad off to find a small access plate under the water pump take this off to find the pump shaft nut. Then take every thing off round pump and the mounting nuts of the pump wiggle it loose to break gasket seal. Get someone to hold and gently pull on pump with mounting nuts off. Get a copper drift and give shaft a good tap it will jump off the taper. Do not ram bars in and lever pump off you will damage it but equally you must pull on pump slightly to make sure the gear is up against the timing case so the force of yhe hammer blows does not transfur in to the pump. The ideal way is to make a puller which I have for the newer ones but not sure it would work on the old ones unless you took the whole timing case off? Depends if you can see the 2 threaded holes in the gear from the access plate or not. A puller is the best way and the only way on the later ones as the tapers on the gear are so much tighter that the old ones. Dont worry about timing the pump is keyed to the gear so nothing to go wrong.
 

bobk

Member
Location
stafford
Starter needs to come of and even the oil pressure switch , biggest pain is taking the bottom nut off the pump, may as well get it reconditioned whilst it off.
 

ACEngineering

Member
Location
Oxon
Starter needs to come of and even the oil pressure switch , biggest pain is taking the bottom nut off the pump, may as well get it reconditioned whilst it off.
I cant think why the starter needs to come off? Oil pressure switch maybe depending on type yes.
Bottom nut on pump will be awkward because hydraulic pump is in the way. Ideally you need a 4way 13mm spanner and I have a banana shaped 13mm ring spanner modified with a grinder which helps.
 

bobk

Member
Location
stafford
I cant think why the starter needs to come off? Oil pressure switch maybe depending on type yes.
Bottom nut on pump will be awkward because hydraulic pump is in the way. Ideally you need a 4way 13mm spanner and I have a banana shaped 13mm ring spanner modified with a grinder which helps.
Ours is 525 so maybe a little , but needed to remove starter to get extension bar ont nut , not enough room for a spanner .
 

D C

Member
Location
Endmoor cumbria
I think its a strip down of pump as seal fits from the inside I think. They do on later machines anyway but I could be wrong on an old one.
Taking it of is easy enough.
Move or take rad off to find a small access plate under the water pump take this off to find the pump shaft nut. Then take every thing off round pump and the mounting nuts of the pump wiggle it loose to break gasket seal. Get someone to hold and gently pull on pump with mounting nuts off. Get a copper drift and give shaft a good tap it will jump off the taper. Do not ram bars in and lever pump off you will damage it but equally you must pull on pump slightly to make sure the gear is up against the timing case so the force of yhe hammer blows does not transfur in to the pump. The ideal way is to make a puller which I have for the newer ones but not sure it would work on the old ones unless you took the whole timing case off? Depends if you can see the 2 threaded holes in the gear from the access plate or not. A puller is the best way and the only way on the later ones as the tapers on the gear are so much tighter that the old ones. Dont worry about timing the pump is keyed to the gear so nothing to go wrong.
Thanks I'll get a look at the job soon and see how it goes, and hope the seal fits from the outside
 

ACEngineering

Member
Location
Oxon
Ours is 525 so maybe a little , but needed to remove starter to get extension bar ont nut , not enough room for a spanner .
Thanks I'll get a look at the job soon and see how it goes, and hope the seal fits from the outside
When pump is off the is a circlip holding a washer on pump shaft yhe seal is behind this but dont know if it just pulls out and a new one fits in or if its fitted from the other side.
 
Possible but unlikely. It'll smoke well for £10 quid or so you could try it but I have only seen this problem once made worse by a blown boost diaphragm so fuel tank was pressured but turbo so when stopped it flooded the turbo with fuel!
It happened our 996 David brown once, we got injector pump done up and all that was wrong was the heater plug :oops:
 
Had a problem with the 1210 brown as well once, my own fault though. The spring had broken on ignition switch and I forgot to turn it back far enough so it was heating until lunchtime :oops: Oil must have been very thin because it needed crankshaft not long after
 

Advanced analytical services for agriculture

  • 105
  • 0
We have added a number of new products for lab analysis. Need an analysis right now? Easily access the most popular analyses on Farm Marketplace.

Special offer - 5% off for the next 3 weeks

Simply purchase the service you require and you will receive an email on where to send the Soil /Silage / Forage /Hay for analysis.

The lab then do the analysis and email you the results. Its as easy as that.

All Analysis options can be seen here - https://www.marketplace.farm/grain-storage/analysis-and-measuring/

Soil testing can be found here - https://www.marketplace.farm/grain-storage/analysis-and-measuring/soil-life-check/

Deep insight into the life in your soil. The Most Detailed Look at the Life in your Soil...
Top