155d injector cleaning

[chevy791979]

I'm going to try and disassemble and clean my injectors on my 155 before I replace them. I've rebuilt many injectors before, but never these type? Anyone know if I can take these apart without having to set/reset pop off pressure? Thanks in advance.

 

[California]

Might be related: YM240 (same injectors?) manual describes cleaning the injectors and it sounds like that was intended to be owner-performed maintenance.

I chuckle each time I recall the relevant paragraph, approximately: 'carefully scrape the sealing surfaces using only mutton tallow on a wooden stick'.

For the YM240 I replaced mine, it was clearly the first time they had been out in 30+ years. Two at about $110 each.

 

[chevy791979]

Ya I figured I'd try to clean these first. It can't hurt it and if it doesn't help I'll replace them.

 

[4get gto]

Boy I had to Google that one..

"using only mutton tallow on a wooden stick'."
Don't know if it should taste good or be slippery...:laughing:

 

[thepumpguysc]

Just get the #'s off the nozzle [tip] & search it.. prob. find them a hellovalot cheaper..

 

[California]

Just get the #'s off the nozzle [tip] & search it.. prob. find them a hellovalot cheaper..

Replace only part of the injector?

 

[normde2001]

Why are you doing this?

 

[thepumpguysc]

Yes.. only the tip.. That's all a rebuilt inj. is.. a new tip & reset the opening pressure to spec.. with a POP TESTER.

 

[4get gto]

Yes.. only the tip.. That's all a rebuilt inj. is.. a new tip & reset the opening pressure to spec.. with a POP TESTER.

What kind of results can one expect it you don't use a POP TESTER..

 

[California]

Yes.. only the tip.. That's all a rebuilt inj. is.. a new tip & reset the opening pressure to spec.. with a POP TESTER.

I wish I had been told this. The injector shop I went to to seemed to be thoroughly professional, and told me without seeing my injectors that replacement was the only option. When the two injectors arrived from their regional distributor one was NOS in the old green parts packaging that was superseded sometime in the early 80's, and the other was in a current box. Identical parts but I didn't really want one that had sat in a warehouse for 30 years.

I wish I had known that they could have rebuilt mine.

 

[thepumpguysc]

Not all fuel shops are equal..
There ARE some injectors that are "throw-aways".
but not a Yanmar injector.
THEY told you it had to be "replaced" sight unseen?? wow.. didn't even test it??
HOW can you condem something without testing it??
THATS FAR FROM "thoroughly professional"!!!
Its not all a lose, if it fixed your problem..??

 

[California]

Not all fuel shops are equal..
There ARE some injectors that are "throw-aways".
but not a Yanmar injector.
THEY told you it had to be "replaced" sight unseen?? wow.. didn't even test it??
HOW can you condem something without testing it??
THATS FAR FROM "thoroughly professional"!!!
Its not all a lose, if it fixed your problem..??

Yes, replacing the injectors that had obviously never been removed in 30 years restored easy starting.

For your amusement here's a thread I posted at the time:

Injector removal tool - (cheapskate version) - photos

 

[thepumpguysc]

I read the 1st page.. seems like you did the right thing..
I've gotten them in, IN THE HEAD.. the guy could get'm out.. and.. I'v gotten them in "in pieces".. where the customer had ripped them apart trying to get them out.. SO all in all, you did GOOD.
I see in your post, you had the breakdown.. where it shows the tip.. {Oh well, live n learn}

 

[chevy791979]

Yes.. only the tip.. That's all a rebuilt inj. is.. a new tip & reset the opening pressure to spec.. with a POP TESTER.

I have a pop tester that I use. More or less wondering what seals and such I'll need. Other than the combustion seal

 

[chevy791979]

Why are you doing this?

Harder starting than I feel I correct and it smokes black ALOT.

 

[chevy791979]

Yes.. only the tip.. That's all a rebuilt inj. is.. a new tip & reset the opening pressure to spec.. with a POP TESTER.

Do you know the pressure specs?

 

[winston1]

Do you know the pressure specs?

Suppose to pop at 2276psi.

 

[chevy791979]

Suppose to pop at 2276psi.

Thank you

 

[thepumpguysc]

If the pressure is "slightly" low..50-75psi.. go ahead & adjust it.. thats "IF" the spray pattern, leak down & chatter is good..
but if the pressure is 100-200 psi low, replace the nozzle.. the valve lift has worn out of spec..
I had a set the other day{Kubota} that by changing the tip, raised the opening pressure 400psi.. {to spec}
While testing 1st, they ALL opened at the exact same pressure{low} but 2 of the 3 had REAL BAD spray patterns & wouldn't chatter..
I replaced ALL 3 nozzles & they worked flawlessly..

 

[chevy791979]

Duelly noted. Thank you I'll post results when I get time to tear into it.