Thread: rebuilding a td5

There should be no reason at all that a rebuilt one will not 'be quite right'

Start looking at other stuff. MAF readings ok?

Is it Auto or Manual?

The engine had been dusted when we bought it, no.1 bore was had it, it was re sleeved and all bored out 020, New pistons rings bearings etc ,block decked, New valves , head skimmed , runs really well but drops off over about 2800 rpm, we were told not to rebuild it but did, have had it checked by a lr place and they agree it's not quite right and they say it's probably because we rebuilt it, which I don't agree with, now had it chipped goes better but still lame after about 2800 rpm. Has been on the nanocom and auto logic, nothing wrong.

cheers James

sounds more like a tuning issue to me, are the injectors coded into the ECU , have you removed blocked converter, what size exhaust ? how much boost are you getting. go for a run and log it on the nanocom, post the csv file here for us the have a look.

as you suggested your MAF is stuffed, putting a loaner on a chipped engine wont harm it, where did you hear that one from, there seems to be a lot of misinformation out there. (at 455k your friends MAF will be stuffed too)


theres a good thread on a Td5 rebuild worth looking at in UK too

Anyone interested to have a look at the inside of a TD5 engine I am rebuilding?


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It was the map sensor not the maf,I only meant there is no point test my car against my friends unchipped one to see if a different map makes a difference, will post a csv later but the kids broke my laptop (was accidental) so I'm on a tablet, and readings range from 58 at idle to a peak of 620, boost is about 238 minus ambient, but the boost controller seems to spike a bit compared to my friends one.The map is looking like it is good but I do wonder if it's lying, guess need to attach a boost gauge, and all sensors are clean.

cheers James

Originally Posted by shack

The engine had been dusted when we bought it, no.1 bore was had it, it was re sleeved and all bored out 020, New pistons rings bearings etc ,block decked, New valves , head skimmed , runs really well but drops off over about 2800 rpm, we were told not to rebuild it but did, have had it checked by a lr place and they agree it's not quite right and they say it's probably because we rebuilt it, which I don't agree with, now had it chipped goes better but still lame after about 2800 rpm. Has been on the nanocom and auto logic, nothing wrong.

cheers James

Problems at higher rpm suggest airflow and/or boost problems. How is the turbo?

It's not just boost numbers that matter. A sick turbo will produce higher back pressure that kills performance. Even a stuck wastegate can do that.

Originally Posted by CraigE

As said what do you call a rebuild? Most modern diesels in 4x4s dont rebuild well. Case in point at work if a diesel Toyota, Ranger or Colorado engine pops, a new engine goes in and the old one is just robbed for spares.

Id hazard a guess that there is a lot more to that than just a modern diesel engine wont rebuild well. Labour, time off the road for owner, trouble shooting problems, warranty etc. There is a bigger picture there than just the engine for a major workshop, dealer doing the whole shooting match.

Originally Posted by goingbush

theres a good thread on a Td5 rebuild worth looking at in UK too

Anyone interested to have a look at the inside of a TD5 engine I am rebuilding?


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Check the poster, that's Petes thread
Great thread none-the-less.
I lurk on the Pommy D2 forum and a few of them have had full engine strip downs and rebuilds and have no issues with them.
OffTrack, didn't wardy have his rebuilt?

DM, I forgot I even posted it on there. I thought they may be interested as they dont get them over there, and that forum is quite good for the v8's

Here is a log from yesterday on the way home,( you will need to remove the zip extension, haven't got a smaller file and this was too big as csv ),logs from the other td5 look much smoother than this one, its an auto also,got everything pulled off the turbo at the moment checking, intercooler pipe has started de-laminating but would not yet be blocking it I feel,just checking the boost modulator at he minute.