On Wed, 9 Apr 2008 22:58:40 -0400, "Roger Long"
wrote:

I just looked at the manual and Bruce is certainly right. Although there is
just a simple two bolt clamp ring holding the injectors in, there is enough
bury of the body in the head that those closely machined surfaces are going
to be a bitch to pull apart after who know how many decades since the last
time.

I'm wondering now if I could actually get the required tools into the
restricted space around the rear injector on my boat. I might find that my
engine had to come out if the injector was really tight with a little
corrosion in there. I could remove the bolts and clamp ring but the prying
part might be difficult.

Bruce has a lot of experience but I would want some face to face advice from
a mechanic and a lot of manual study myself if I was going to tackle this
job far from home. The appearance of the engine makes it look easier than I
now think it is.

Face to face is best (except for conning somebody into doing it for
you :-).

I don't really remember what I used to get the injectors out of the
last Yanmar I worked on but it wasn't anything I didn't have in the
tool box so it must have been a short pry bar or a big screwdriver
sort of tool.

I didn't mention it before but Yanmar recommends removing the
precombustion chamber and replacing the copper washer seals for that
when changing injectors. From the top there is the injector, next an
"o" ring, then a gasket, next the "heat shield and a copper washer,
then the precombustion chamber and a last copper washer. Yanmar
recommends pulling the whole lot and replacing all the gaskets, copper
rings and the "O" ring.

I'm certainly not recommending disregarding Yanmar's instructions but
I have personally changed injectors by pulling the injector and
inserting a new one, changing the seal between the injector and the
"heat shield". If you do pull the precombustion chambers note that
some of them have a pin so they must be inserted with the correct
orientation.







Bruce-in-Bangkok
(correct email address for reply)