New 603.972 not perfect yet - need help
Dear all,
it seems my endeavor is not finished.
The new engine rund perfect, is a March95 engine, 190k, good oil pressure, excellent start.
With 80ºc thermostat, engine is always around 80ºc, full gas 90ºc.
After a good ride and really hot I can open the expansion reservoir, not even a small puff, perfect.
But.....
I've no real power, climbing from low revs it makes sometimes a strange noise, like a screech, continuous an disappears, a not real power, when uphill engine has dificulty to go over 2000 revs.
It On the road it seems a diesel without turbo, or with a very low pressure it does not builds enough pressure.seems like the turbo as a leak... when it starts building pressure it leaks...
On flat areas, I can get to 110-120km/h with difficulty.
I've dificulty to kickdown and gear changes are more brutal.
I've checked the vacuum lines and turbo was rebuilt on April.
With the car stopped and we accelerate it seems to rev normally, no smoke... seems perfect.
Any ideas?
BR
Antonio
I had a Toyota that did the same thing, until the pump was turned up a bit, and then a different vehicle,
Hello Antonio,
I do not know if you have provided any background information or not like vehicle mileage etc. But expect turbo wear in high mileage vehicles. To check for this is remove the rubber hose or piping just on the turbo outlet exposeing the turbine.
Hold firmly with thumb and finger the center nut and lift up and down in a 12 and 6 O'clock position. Obviously ther would be a tinest movement but if it is excessive it will move a lot; if so, its worn and get a second opinion from the turbo specialist.
Do not tell them you know it has excessive play but ask them to check and report on it and ask also what the tolerence should be and what they have recorded.
To test turbo boost you will need a boost gauage and this will need to be connected to a suitable point on the inlet tract, a point after the turbo and inlet manifold. Once connected start the engine and check boost you get against engine revs. This is best tested under load, i.e. whilst driving.
Another contributor has provide this test, check your other thread.
.8 bar is factory original output...try with air cleaner /intake pipe off...350 running well is sweet and powerful...sounds like short of fuel...only the best Bosch specialist can set these pumps to optimum....Axel and I have only found one competant and interested agent in a 100 mile radius of Bristol
Maybe a little more advance until you hear that classic diesel knock/crackle sound
RE: Toyota - one of the world greats in certain guises 4.2 legendary long life old school engine ,can be juicy when worked hard.
Thanx, I tried that, even changed from the previous engine, basically the same.
Tomorrow I go to MB dealer, that's where the turbo was changed with a rebuild one (I kow where they source the repair - BOSCH center).
I really have a bad feeeling, it seems like a metal noise... like when turbo is in full load, some metal contact.
Sometimes it makes the noise, other times it doesn't, it start's screaming around 2000 rev's.
How we check the turbo boost? any ideas/pics to place the sensor?
BR
Antonio