[AT] Isuzu smoke problems

[Cecil Bearden]

Bruce:
The smoke is definitely unburned fuel.  Is the compression OK??  I know it 
is a  pain to check, but if the spray patterns were bad, it could have some 
burned top rings.

Cecil in OK


----- Original Message ----- 
From: "Bruce Fallon" <bfallon at whidbey.com>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Saturday, November 05, 2005 6:45 PM
Subject: [AT] Isuzu smoke problems


>I bought a 1986 Isuzu cab forward truck with a 14 flatbed dump ( to haul
> tractors ). This is a 3.9L 4 cyl Turbo Diesel 5 speed manual. The PO had
> replaced the turbo with a later unit which is water cooled the original 
> did
> not have water cooling. From what I understand it was a fairly common
> upgrade. The problem I have is smoke light blue to white on startup really
> bad, after warm-up the following conditions under load smoke is not a
> problem under coasting with no load just using the throttle to maintain
> speed I am blowing light blue smoke.  If I am completely off the throttle 
> no
> smoke, as I transition back to power short cloud of light blue then clean.
> I just had the injectors rebuilt the injectors pressure was low and the
> spray patters were bad to poor.   I changed the oil and filters.
> I have not had it very long but I did not notice any drop in the oil 
> level.
> It smells like diesel not engine oil burning. I believe this has 162K 
> miles
> and it is probably a California vehicle with the timing set 6 degrees 
> BTDC.
> According to the book Federal timing is 14 degrees BTDC.
> I am surprised at not being able to find very much information on this
> engine on the Net.
> One thing I am wondering about is the original turbo had a wastegate on 
> the
> turbo unit to dump excess pressure into the exhaust.  There is no 
> wastegate
> in this system now. I do not know how much boost it is running. In looking
> at pictures of other later engines  they look the same as mine plumbing 
> wise
> with no visible wastegate.
>
> Anyone experience this before or know about these engines.
>
> Bruce Fallon
> Freeland WA. 98249
> bfallon at whidbey.com
>
>
>
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> Remembering Our Friend Cecil Monson 11-4-2005
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