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[email protected] ohara5.0@mindspring.com is offline
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First recorded activity by BoatBanter: Jun 2007
Posts: 714
Default Yanmar Injector question

On Apr 10, 10:34 pm, RichH wrote:
Injectors in 2QM and 3QM engines are easy to remove ... just two bolts
on the injector hold down (just be sure to 'vacuum' the injector bore
with a strong vacuum to prevent 'crap' from falling into the
combustion chamber before you pull the injector out).

The injectors are also easy to send to an injector shop to be checked
or rebuilt.
"Injector shops" are common in metro areas .... as virtually all
automobiles and trucks nowadays have injectors.

The 2QM and 3QM engines are not all that sensitive to air in their
fuel lines, especially air in the lines downstream of the injector
pump; just bleed out as best you can ... and the engine will usually
start right up.


I've done it and it is absolutely trivial. I didnt even replace the
copper seals but simply re-used them. In fact, I removed the
injectors several times (on the mistaken notion they had a problem)
and always re-used the copper seals, no problems at all. My copper
seals always came out with no problems. The banjo unions have never
been a problem even whn I lost the copper seal and cut one from an
aluminum beer can; it worked well for months till I properly replaced
it. Bleeding is also trivial. I am not a mechanic but I am not
afraid to try anything.