G'day guys;

I know there's been a few questions raised with regards to 300tdi's recently , However I have a question of a slightly different nature , Recently I changed the timing belt on my 300tdi ( 180K ) ,checked & adjusted Valve Clearances ( 0.2 mm Intake/exhaust ) new Air Filter , Sedimeter cleaned , new fuel Fiter , Throttle cable adjusted etc , I religoulsy Keep the Vehicle well maintained ,but lately the old girl has been really down on Power , Not sure what else to check for ?? any suggestion would be Welcome , Perhaps Injectors need a Clean/service ?
Would it pay for me to take her down to Graeme Coopers or BDP Landys etc and have them check Pump timing / cam Timing etc would a Dyno test done be benefitial ? to see if there are any factors affecting performance ? Pump was tweeked but has been set back to factory spec.

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300tdi Discovery 97 Man ,Tweaked. Maxi Rear,4.11's F/R
TRV=Toyota Recovery Vehicle
93 RRC Vogue "Shopping Trolley".

Have you checked the turbo-2-intercooler hoses recently? If they have delaminated from the inside they could be blocking your flow.

Could it be possible that the poor performance began after the timing belt chance? Maybe the timing is a little out?

BTW my injectors have done 350,000km and still going well.

Hi Taz;

Turbo and Intercooler Hoses have been replaced earlier in the piece with Silicone ones , I go mine from here TurboXS - Home

The Pump was pinned down so that it wouldn't go out of timing before the timing Belt was changed , it may have been out of timing prior to changing the timing belt ??????


Injectors were serviced at 136K , I now have 185K ...so I dare say it's not the injectors then ...

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300tdi Discovery 97 Man ,Tweaked. Maxi Rear,4.11's F/R
TRV=Toyota Recovery Vehicle
93 RRC Vogue "Shopping Trolley".

filled up laterly............not crappy fuel is it.

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Hi lou

it could be bad fuel perhaps ? although I haven't filled up for 5-6 weeks now because the vehicles wasn't driveable, both Diffs were out of the car , sent away for 4.11 to be put in. the car is booked in anyhow with Graeme coopers on 27th , I can't think of anything else I need to check for for poor performance.

engine seems to be labouring on low rpm . perhaps Turbo ?
but once it gets going she is Boosting right up 15psi . EGT's is also normal..

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300tdi Discovery 97 Man ,Tweaked. Maxi Rear,4.11's F/R
TRV=Toyota Recovery Vehicle
93 RRC Vogue "Shopping Trolley".

Fitting the pin in the pump only facilitates correct timing. It holds the drive flange against the timing advance spring.

It does not guarantee that the camshaft pulley does not move out of position while the timing belt is fitted.

It is very easy to get the timing (injection pump or camshaft) out by 1 (or more) teeth while fitting the belt if you do not ensure there is absolutely no slack in the belt on the tight side from the crankshaft pulley. Ensuring that is easier said than done while getting the belt over the pulleys and tensioner.

IMHO, after fitting a timing belt, it is best to rotate the engine a couple of times, then double check that all of the pulley marks, timing pin and flywheel notch line up correctly. Only after this is verified, go ahead and fit the timing belt cover.

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John

Check the condition of the diaphragm on the top end of the fuel pump & that the mechanism moves OK.

M

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Before you go too mad . Go and buy some diesel replacement adative from Super cheap or somthing. The problem these days is that Tdis need sulphur like the old petrol engines need lead. What happens is cheap fuel, normal supermarket fuel has less sulphur and then that afects the injector pump which ruins the amout of power you get out of the car ( and will in the end jam the injector pump ). The car seems slugish and crap on hills. But once you put in the adative which contains sulphur is puts it back on track and you get the power back

As i said i would do this first befoe ripping the engine apart, even more so as there is so much chaep fuel around at the moment. Was and is a problem in the Uk

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95 300 Tdi Defender 90
94 300 Tdi Disco

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Thanks everyone for all your replies;


John;
the Camshaft Pully was out by 1-2 teeth ( i think ) prior to the Fitament of the New Timing Belt ,we readjusted this before Fitment of Timing Cover , and My Mechanic checked this as well , on idle if I operate the throttle cable engine is very responsive , the old girl is smooth , as soon as some load is applied then specially on low RPM she is not quite as responsive...drops down on performance , sluggish somewhat...

Reads , I used CEM Cost Effective Maintenance "Clean Power" to clean the injectors a Few Months back but I'll give it another Go , thanks for reminding me mate.

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300tdi Discovery 97 Man ,Tweaked. Maxi Rear,4.11's F/R
TRV=Toyota Recovery Vehicle
93 RRC Vogue "Shopping Trolley".

I have to disagree with you on Sulphur.

Sulphur is an impurity in diesel and does nothing beneficial. It is harmful to engines (Sulphuric acid is a byproduct when diesel is combusted) and people.

It is a side effect of the processes used to reduce the Sulphur content in diesel that is responsible for the problems with lubricity and rubber seals.

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John