Nanni Diesel T4 155
Hi all, I have a motor boat that has a Nanni t4 155 hp engine, the problem is When engine is running up to 2000 RPM every thing appears to be ok, on increasing revs the engine starts to miss and power falls off until I bring it back down to 2000 rpm, I have tested the engine along side with GB clutched out, on raising the rpm the engine starts to miss with a lot of white smoke coming from exhaust.
The fuel filters and injectors have been changed, pipe work checked for tightness, all appears ok.
I have tried the engine for a short time with sea suction closed so that no water passes through charge air cooler, When this is tried the white smoke disappears and engine runs smoothly. Open sea cock and after a short while white smoke returns and engine starts missing.
I realise that I can only run engine a short time without cooling as this will do the jabsco no good
Anyone out there had this problem before