155d injector cleaning

chevy791979 · Aug 31, 2018

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 · Aug 31, 2018

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 · Aug 31, 2018

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 · Aug 31, 2018

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 · Aug 31, 2018

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

California · Aug 31, 2018

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

Replace only part of the injector?

normde2001 · Aug 31, 2018

Why are you doing this?

thepumpguysc · Sep 1, 2018

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 · Sep 1, 2018

thepumpguysc said:
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 · Sep 2, 2018

thepumpguysc said:
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 When the two injectors arrived from their regional distributor one was NOS in the old green parts packaging that was superseded sometime in the early 80's, and the other was in a current box.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.