yanmar -ysb 1974 engine- poor starting
 

the above is an old lady and very difficult to start. compression ok,
new injector and injector pump, replaced diesal fuel. will start by use
of easy start and there after tick over ok. lots of smoke and carbon or
oily discharge when run at full revs.

any ideas.

have already had the suggestion of the exhaust being partially blocked
but have not taken this futher.

yanmar -ysb 1974 engine- poor starting
 

On 30 Oct 2005 04:42:03 -0800, wrote:


the above is an old lady and very difficult to start. compression ok,
new injector and injector pump, replaced diesal fuel. will start by use
of easy start and there after tick over ok. lots of smoke and carbon or
oily discharge when run at full revs.

any ideas.

have already had the suggestion of the exhaust being partially blocked
but have not taken this futher.


It seems that the engine is not breathing well, so the combustion is
fuel rich.

Brian Whatcott Altus OK

yanmar -ysb 1974 engine- poor starting
 

yanmar -ysb 1974 engine- poor starting
 

what is the compression?

when the high pressure pump was replaced it may have changed the fuel
timing. This timing is critical.

did the rack get hooked up correctly to the pump?

If I were to guess I would say fuel timing...


"Dennis Pogson" wrote in message
...
wrote:
the above is an old lady and very difficult to start. compression ok,
new injector and injector pump, replaced diesal fuel. will start by
use of easy start and there after tick over ok. lots of smoke and
carbon or oily discharge when run at full revs.

any ideas.

have already had the suggestion of the exhaust being partially blocked
but have not taken this futher.

Had a similar problem some years ago on a similar engine. An old diesel
engine mechanic found that the engine had been re-built and the valve
timing
gear was one tooth out. Made a huge difference to the power once it was
re-assembled.

yanmar -ysb 1974 engine- poor starting
 

Rick wrote:
what is the compression?

when the high pressure pump was replaced it may have changed the fuel
timing. This timing is critical.

did the rack get hooked up correctly to the pump?

If I were to guess I would say fuel timing...


"Dennis Pogson" wrote in message
...
wrote:
the above is an old lady and very difficult to start. compression
ok, new injector and injector pump, replaced diesal fuel. will
start by use of easy start and there after tick over ok. lots of
smoke and carbon or oily discharge when run at full revs.

any ideas.

have already had the suggestion of the exhaust being partially
blocked but have not taken this futher.

Had a similar problem some years ago on a similar engine. An old
diesel engine mechanic found that the engine had been re-built and
the valve timing
gear was one tooth out. Made a huge difference to the power once it
was re-assembled.

It may have been the fuel timing, it's a long time ago now!

yanmar -ysb 1974 engine- poor starting
 

In article .com,
wrote:

the above is an old lady and very difficult to start. compression ok,
new injector and injector pump, replaced diesal fuel. will start by use
of easy start and there after tick over ok. lots of smoke and carbon or
oily discharge when run at full revs.

any ideas.

have already had the suggestion of the exhaust being partially blocked
but have not taken this futher.

Smoke at full revs is probably overloading if it's not smoking at
moderate loads.

The starting could simply be a weak battery or undersized cabling,
particularly as the temperature drops.

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's Pages: http://members.dca.net/jerelull/X-Main.html
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/

yanmar -ysb 1974 engine- poor starting
 

Hi rick, thanks for advice. How would you check the timing on this one.
i assume that there is no normal strope light to fix.?

graham

yanmar -ysb 1974 engine- poor starting
 

hi brian.

How do you test for mixture? and how do you adjust.

graham

yanmar -ysb 1974 engine- poor starting
 

On 2 Nov 2005 11:15:11 -0800, wrote:

hi brian.

How do you test for mixture? and how do you adjust.

graham


I'll tell you the auto mechanic's trick for checking a choked exhaust
(i.e cat converter). He will open an aperture - like a converter
oxygen sensor - removing it makes a hole - noisy but allows him
to tell if the engine then runs better....

For a boat engine - you need to decide what can be temporarily opened
up.

Brian W