Johnf7

Have my series 6 FD for nearly 3 years now, do all work and servicing myself. Rebuilt the engine 2 years ago. Its got fuelling mods, intake, exhaust, tuned PFC, boosting to 13psi on sequential twin turbos.

For the last while I have had the car off the road trying to source a coolant leak, last weekend I pulled the turbos for a second time and Im still none the wiser to where its leaking from.

here are the facts:
- The leak is dripping from the outside of the vacuum line that connects to the turbo control actuator under the exhaust manifold. About 10 drops a minute with the engine running, with the engine off it slows as the pressure in the coolant system decreases
- There is also a sizzling noise that is coming from the turbo area, can only be heard after engine is shut down, again only a few drips - only slight smoke
- Both front turbo coolant lines have been replaced with Mazda OEM lines.
- All crush washers on the Turbos were replaced
- Coolant line behind the WP was replaced and seems dry
- Coolant line from AST to Filler neck was replaced.
- Coolant line at the back of the engine was replaced
- Coolant line under TB was replaced
- New Rad hoses that are tight.
- The OMP area is wet and has Oil residue and is dirty. Next weekend Ill take off the OMP and have a look around that area. BTW new OMP lines where used when I rebuilt the engine


Thats all I can think of now. At the moment the Turbos are off the car, I took them off again thinking there might have been a crack in the turbo water jacket but after close inspection Im not sure. I have completely run out of ideas and would really appreciate some solid direction?? Any suggestions?

Thanks
John

rx7brandon

iTrader: (1)

bake the turbos in the oven to get them hot. then check for cracks. they are meant to expand and contract. or get a magnaflux jr kit ($20) and dye check it.

badddrx7

iTrader: (7)

It's a crack - take the guys advise above and magnaflux it


later