[AT] Isuzu 4BD1T

[Bruce Fallon]

I have an Isuzu NPR with the 4BD1T diesel motor in it.  When I got it it 
smoked on cold startup light blue cold diesel fuel smoke.  Under load not 
noticeable, with some throttle and no load just cruising blue fuel smoke not 
oil, full throttle no smoke, off throttle no smoke.
Anyway I have since replaced the turbo after bearing failure, replaced 
rings, had valves done and new guides and seals, head shaved, injectors 
rebuilt.  I did find broken top ring on number 4 cylinder and way too much 
end gap on all rings.  Compression was low.  Now after all the work I still 
have the smoke problem.  Does anyone know if the timing on the injector pump 
is off will this cause the smoke? I am thinking the timing is retarded, 
injecting late and not burning completely. It is definitely fuel smoke and 
not lube oil. When I contacted the dealer today they told me the Isuzu 
manual is not correct in their procedure for setting the timing on these. 
They say if I follow the Isuzu manual I may see broken piston skirts. They 
want $250.00 to set the timing. Anybody know a good diesel place to take 
this to in the Seattle, Everett, or north areas into Burlington Washington?



Bruce Fallon
Freeland WA. 98249
bfallon at whidbey.com 



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