D24T.com  

Go Back   D24T.com > Technical Discussion Area > Diesel Engine and Drivetrain

Reply
 
Thread Tools Display Modes
  #1  
Old 06-24-2019, 07:18 AM
Eetuml Eetuml is offline
Junior Member
 
Join Date: Jun 2019
Location: Finland
Vehicle: 740 d24tic
Posts: 1
Default D24 oil pump priming??

How can i prime the oil pump on my d24. I have turned the engine over with the starter and it is not getting yet eny oil pressure. Please help
Reply With Quote
  #2  
Old 06-24-2019, 09:23 AM
v8volvo v8volvo is offline
Supporting Member
 
Join Date: Jun 2009
Location: Livingston, MT
Vehicle: '86 745, '83 764
Posts: 1,098
Default

Is this on a newly rebuilt engine that has never been run yet? (I.e. the oil system is dry and you are trying to prime it for the first time before starting it?)

It is definitely a challenge to prime the oil system for the first time on these engines especially if the oil pump has even a slight amount of wear on the pump lobes or on the pressure relief piston and bore. But I have had these steps give good results:

1) Disassemble oil pump, coat all internal oil pump surfaces AND the pressure relief piston thoroughly with engine assembly lube (needs to be done with front end of engine still apart of course, you might not want to take it all back apart at this point) -- this helps the pump create stronger suction to pull oil up from the pan

2) Use a very lightweight engine oil for the first start that can move easily up the pickup tube, cheap conventional gas-engine 5W20 or 5W30 works well (you will drain it out after running a few minutes anyway), and overfill the crankcase by 2 or 3 quarts -- this won't hurt anything for low rpm running and reduces the distance the pump needs to pull oil up from

3) Remove the injectors -- this allows the starter to spin the engine (and oil pump) as fast as possible

4) Fill the oil filter up with oil before installing it

By doing these steps my experience has been that the engine will build oil pressure in less than a minute of cranking on the starter. After you see oil pressure come up, best to continue cranking it on the starter a little while longer to ensure oil reaches not just the pressure sender location but also the cam bearings, turbocharger, etc. You can then reinstall the injectors (with new heat shields) and start the engine.

The other option is to buy or borrow a pre-oiler apparatus that uses shop compressed air and screws into the location of the oil pressure switch on the side of the block, then directly primes the oil galleries that way. But that requires expensive machinery and access to shop air, and it runs a risk of contamination since it involves feeding oil into the lubrication passages without going through the oil filter.
__________________
86 745 D24T/ZF 340k lifted 2.5"
83 764 D24T/M46 145k
93 Toyota 4x4 pickup 1.9 TDI swapped
01 Audi Allroad 2.0 TDI swap in progress
02 F250 SD 5.4/4R100
Reply With Quote
  #3  
Old 07-16-2019, 12:44 PM
v8volvo v8volvo is offline
Supporting Member
 
Join Date: Jun 2009
Location: Livingston, MT
Vehicle: '86 745, '83 764
Posts: 1,098
Default

How did it go for you? Were you able to get the pump to prime?

Please let us know your results to add to the group's knowledge on this.

Since you are a new member it's worth mentioning that we try to maintain a policy here: if you ask a question and other members reply and try to help you, it's best to circle back afterwards to report what your outcome is and what you did to achieve it. That keeps up a two-way flow of information that helps everyone involved in the discussion, and also helps anyone else who finds the discussion in the future with a similar issue. We might learn something new from your experience.

Thanks and welcome to the forum.
__________________
86 745 D24T/ZF 340k lifted 2.5"
83 764 D24T/M46 145k
93 Toyota 4x4 pickup 1.9 TDI swapped
01 Audi Allroad 2.0 TDI swap in progress
02 F250 SD 5.4/4R100
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -8. The time now is 03:32 AM.


Powered by vBulletin® Version 3.8.10
Copyright ©2000 - 2019, vBulletin Solutions, Inc.