D5252T Pump Timing

[artiedtke]

Hi guys,

A couple of questions with regards to the Pump Timing on the D5252T:-

My belts were last changed at 198,000, current mileage is just over 230,000.

I believe the pump timing needs to be adjusted regularly.

I am experiencing as of recently some rough running (could be becuase of top mount needs doing) along with pretty much no performance below 2000 rpms.

In the past the car has hardly ever seen the far side of 3000 rpms, but now especially when overtaking I am having to push it further.

I am not experiencing any 'hard starting' issues, however phsycologically maybe the car is turning over one more time that it used to do before actually starting.

How often is it advised to have the pump timing checked ??

Any reccomendations on any indipendants in the North Wales area ??

How much should i be looking at for a good indipendant to check/adjust pump timing ??

Are the symptoms above attributed to pump timing being 'out' or am i barking up the wrong tree ???

Many thanks guys.

Edit: Forgot to add, oil is changed every 7000 miles, levels checked regularly, never uses oil or water etc. so i believe the engine to be in 'healthy' condition. Not sure if the turbo is boosting properly (no gauge) bu you can definately hear it spool up around 2000 rpms and there is a sudden surge of power so it is doing something, just not as much power it seems as there used to be.

[PNuT]

http://www.volvoclub.org.uk/850_70_service.shtml

every 20K according to this

[BillB]

The cambelt and pump belt are bound to stretch a little over time so a pump timing adjustment is maybe worth doing at say 40k intervals. However, the pump belt is supposed to be changed after 40k anyway although I would think most people leave it until the cambelt is due (80k interval). Yours has done 32k since the belt change so should be OK, certainly no significant drop in performance. Check for fault codes, you may have a failing MAF especially if it's original. Regards.

[artiedtke]

Originally Posted by BillB

Check for fault codes, you may have a failing MAF especially if it's original. Regards.

No fault codes stored afaik. MAF has however been playing up, it was replaced by the previous owner with a second hand one.

It plays up every now and then, car goes into limp mode, if i disconnect maf and blow on the connections and reconnect car drives fine again !?!?!

I spoke with a VW/Audi specialist and he said that if my timing was ever so slightly out then my car would not start like it does now, he reckons the timing is fine.

He suggested that i run some Shell VPower Diesel though the system a couple of times and i always get supermarket fuel.

Have run a couple of shots of Redex through and engine seems smoother and pulls a bit better.

Your views please ???

[PNuT]

you may find its storing the code even tho the light is off... its what mine was doing!

my car was starting as well when it was 8 degrees out... i suspect it may be a different story in the winter!

[Clan]

Originally Posted by artiedtke

Hi guys,

A couple of questions with regards to the Pump Timing on the D5252T:-

My belts were last changed at 198,000, current mileage is just over 230,000.

I believe the pump timing needs to be adjusted regularly.

I am experiencing as of recently some rough running (could be becuase of top mount needs doing) along with pretty much no performance below 2000 rpms.

In the past the car has hardly ever seen the far side of 3000 rpms, but now especially when overtaking I am having to push it further.

I am not experiencing any 'hard starting' issues, however phsycologically maybe the car is turning over one more time that it used to do before actually starting.

How often is it advised to have the pump timing checked ??

Any reccomendations on any indipendants in the North Wales area ??

How much should i be looking at for a good indipendant to check/adjust pump timing ??

Are the symptoms above attributed to pump timing being 'out' or am i barking up the wrong tree ???

Many thanks guys.

Edit: Forgot to add, oil is changed every 7000 miles, levels checked regularly, never uses oil or water etc. so i believe the engine to be in 'healthy' condition. Not sure if the turbo is boosting properly (no gauge) bu you can definately hear it spool up around 2000 rpms and there is a sudden surge of power so it is doing something, just not as much power it seems as there used to be.

your actual injection timing is managed electronicaly , if it goes out of range for whatever reason the Engine warning light comes on , The mechanical pump setting should be set in the middle of it's range ( -0.5 on the dynamic scale ) then the electronics will cope within reason in compensating the timing for any variations, so the actual pump timing wont need altering between belt changes .

Your lack of torque below 2000 rpm is a classic symptom of a faulty air mass meter , the car is transformed when sorted ..

[artiedtke]

Originally Posted by Clan

your actual injection timing is managed electronicaly , if it goes out of range for whatever reason the Engine warning light comes on , The mechanical pump setting should be set in the middle of it's range ( -0.5 on the dynamic scale ) then the electronics will cope within reason in compensating the timing for any variations, so the actual pump timing wont need altering between belt changes .

Your lack of torque below 2000 rpm is a classic symptom of a faulty air mass meter , the car is transformed when sorted ..

Anybody know where I can get a new one ?? Or is it main dealer jobby only ??

AFAIK the air mass meter on the 850 TDI is a little old fashioned...

[The Hooded Claw]

so the actual pump timing wont need altering between belt changes

RUBBISH!! ...it only take a 2 to 3mm "Tweek" to throw the pump timing out many many degrees ....

what your advocating is wrong ... it does NO HARM to check the Pump Timing when doin a belt change ...& Can save a hell of a lot of HASSLE in the future !!

[artiedtke]

I was quoted £120 to check/adjust the pump timing ??

This is a bit steep innit ???

Although i was told that it doesent need doing as the car would not start as smooth as it currently does, even if it was a smidge out, this is according to a VAG specialist...

[Clan]

Originally Posted by The Hooded Claw

RUBBISH!! ...it only take a 2 to 3mm "Tweek" to throw the pump timing out many many degrees ....

what your advocating is wrong ... it does NO HARM to check the Pump Timing when doin a belt change ...& Can save a hell of a lot of HASSLE in the future !!

excuse me a little politness wounln't go amis . what exactly am i advocating which you not happy with and is wrong ?

The dynamic pump timing MUST be checked / adjusted with each belt change . and yes a tiny tweek CAN alter the timing wildly , what i said above is that once the dynamic timing is set with a new belt it wont go out of range during the service time until the next belt change , any small fluctuations are taken care of by the electronics .. if the light comes on indicating timing out of range it can be because it wasnt set properly according to the fuel tempeature graph in volvos documentation . ie set too close to the upper or lower limit , the correct adjustment under average conditions is -0.5 in volvo terms . I have professionaly dealt with these things on a daily basis since they came out on the 850 Tdi and still do . .