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Home > Technical > Take out CAV diesel pump on oneten 2,5 n/a,1987

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Holmkiern

Member Since: 16 Nov 2020
Location: Upphärad
Posts: 12

Take out CAV diesel pump on oneten 2,5 n/a,1987

Hi all,
I have now tried to fix leakage on ingoing shaft in diesel highpressure pump,CAV type several times but leakage is still there and also high rev is gone so I need to push ful gas just to get motor to idle.
Anyway,now I have decided to take out pump and send it to an expert.

I wonder now if there ate any special things to think about when taking out the pump?
I know about timinig concern and have exchanged belt/tensioner earlier but just wonder how to get pump in right position when putitng pump in car again since I guess the pump turn more than 1 turn per rev.

Thanks
Best regards
Johnny

6th Apr 2021 6:30pm

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3421

2012 Defender 90 Puma 2.2 CSW Santorini Black

Pump turns same speed as the camshaft which is at half the speed of the crankshaft. So for every 2 revolutions of the crank, the pump makes one revolution (this is also fundamental principle of a 4 stroke engine).

I have a diesel turbo, which use very similar pump type. Before I took mine off, I marked the position of the pump relative to the timing case as the pump has 3 elongated holes which can change the timing by a few degrees (1 degree at pump means 2 degree at crank due to the half speed).

If you did not mark the pump, then I would position the pump somewhere half way of its possible mounting angle and see how it goes. The timing belt pulley is keyed on the shaft, so can only go one way. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

6th Apr 2021 6:43pm

Holmkiern

Member Since: 16 Nov 2020
Location: Upphärad
Posts: 12

Hi Dinnu,
I have now started to pull out the cav pump and will also exchange timing belt. One silly question: which way is correct to untorque the screw holding pulley on crank shaft? I dont remember if it is clockwise or unclockwise.
I tried unclockwise but it was like trying to move a rock.

Thanks
Johnny

3rd Sep 2021 7:35pm

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3421

It is normal right hand thread, so anticlockwise to undo. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

3rd Sep 2021 7:46pm

Holmkiern

Member Since: 16 Nov 2020
Location: Upphärad
Posts: 12

Thanks Dinnu, then it is just to add more strength in my arm.
I then need to find the right work shop to deal with the pump.
Br johnny

3rd Sep 2021 9:08pm

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3421

Yes, the nut is done quite tight, sorry I do not have torque figures. Had made a tool to be able to take the torque without applying too much lateral force on the pump shaft. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

4th Sep 2021 7:40am

Holmkiern

Member Since: 16 Nov 2020
Location: Upphärad
Posts: 12

Well,pump is out and sent for repair so now I can start the work on disco while I wait.
Thanks for help.

6th Sep 2021 4:46pm

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