Hi All,
I finally took the Bedford for a test drive today. I had a few problems in the assembly as well as other things away from the bus.
Here's the story for those that are interested.
After machining the housing, I went to fit everything up, yet the turbine just felt tight. So, I decided to strip down the core.
It was basically rooted. The heat shield had corroded away and was rubbing on the turbine wheel. Rendering both US. The internal were gummed up. The only thing salvable was the compressor wheel and the core housing. I think this may have been binding it and thus restricting the exhaust and the true cause of the high EGT's
I put a call into the Chinese who supplied the housings and they immediately offered a refund on the housings due to some shipping damage. I swapped the refund for 2 kits, 4 shields and one wheel set. Some have said beware of the Chinese wheels, but unfortunately, I'm stuck. Nothing else available.
So, they arrive at no cost.
I fitted the kit and Chinese compressor and turbine, however when tightening everything up, the compressor wheel bound on the core. Luckily the original wheel didn't and I fitted it.
I took it to MTQ for balancing as they have been really helpful in providing advice while recognising I was between a rock and a hard place. (Thankyou MTQ Dandy).
They balanced it and commented that it was almost in perfect balance.
Then on full reassembly, the turbine housing was just touching on the wheel when finally clamped down. So, I had to pack the housing out by about 1.5mm. By chance, an old piston ring was the perfect size, and hopefully the perfect material.
Most of this is caused by trying to fit a Chinese housing and wheels to the Japanese core.
After a bit more mucking around lining up the dump pipe, it finally went back together.
The results are;
Boost is much quicker and full.
EGT's. On the old turbo, I was getting 500-650*C on a steady hill 8* incline and they wouldn't fall.... amost like it was a runnaway.
On the new turbo, the EGT's were 500 and steady. And they fall quite quickly after lifting the foot.
One thing though, (this is a front mounted engine), the turbo was really smoky in the engine bay. I'm trying to work out if I have an exhaust leak, or whether it was just the oil in the casting and handling burning off. By the time I got home, it seemed to have cleared.
Q: Has anyone had an experience like this, why the new housing smokes for about 20 minutes when new?
Also, in amongst all this, I did the exhaust brake bushes. The brake may have been binding too.
For anyone that is interested, FJ Bushings (
www.fjbushings.com.au
) are great. They can manufacture bushes and bearing components at a very reasonable cost.
The diff pinion inner bearing had spun on the pinion landing. I was up for a new crown wheel and pinion. However, FJ's made me a new bearing inner (2 thou smaller ID, same OD), case hardened and perfect.
If you have a worn bearing and need something made, give these guys a ring.
thanks
jd
Thanks.
Jon.
