Pagoda SL Group

W113 Pagoda SL Group => Drive train, fuel, suspension, steering & brakes => Topic started by: rgafitanu@gmail.com on October 20, 2017, 20:10:30

Title: When were ball check valves introduced on the injection pumps?
Post by: rgafitanu@gmail.com on October 20, 2017, 20:10:30

I have the opportunity to get a defective injection pump to use for parts. I am interested in the ball valves. There are 2 pumps available, a R20 and a R24Y. Anybody knows which one came with the ball check valves?

Thank you

Title: Re: When were ball check valves introduced on the injection pumps?
Post by: Tyler S on October 21, 2017, 15:09:40

The r24 is a later pump. It does have the ball type check valves, but they will not fit into an r-18 or r-20 pump without machining work. Some later r-20 pumps did have the ball type valves.

Title: Re: When were ball check valves introduced on the injection pumps?
Post by: Pawel66 on October 21, 2017, 15:33:35

Maybe it will help: in the BBB you have the IP listed with modifications that were made. Just had a BBB at hand, see below if possible.

Title: Re: When were ball check valves introduced on the injection pumps?
Post by: rgafitanu@gmail.com on October 22, 2017, 01:34:22

Thank you Tyler and Pawel, I have the BBB book but it doesn’t mention when ‘the ball check valves were introduced. I have access to a lathe to machine them. Are they longer or wider? What do I need to machine?

Title: Re: When were ball check valves introduced on the injection pumps?
Post by: Shvegel on October 24, 2017, 02:06:17

I believe the "Y" designation denotes ball valves.

Title: Re: When were ball check valves introduced on the injection pumps?
Post by: 66andBlue on October 24, 2017, 03:52:06

The "Y" indicates the USA versions of the various injection pumps. See the list here: https://www.sl113.org/wiki/Fuel/Injection

It appears that the ball valves were introduced with the R21 and R22Y pumps.
Thus, to answer Radu's original question: the R20 pump does not have the ball valves.

There is now also a parts list for download in the Tech Manual.

{Crossed out statement about R20 IP, in light of A. Dalton's later post}

Title: Re: When were ball check valves introduced on the injection pumps?
Post by: A Dalton on October 24, 2017, 13:28:29

 Late R18 were upgraded from cone  to  ball valves  [ R18z / 250sl]

R20 pumps had ball.
R22 the balls size  was increased to 4mm.
R24 is the replacement and they retained the larger balls [ 4mm]

Title: Re: When were ball check valves introduced on the injection pumps?
Post by: rgafitanu@gmail.com on October 24, 2017, 16:29:43

Thank you, I am assuming that the 4mm ball valves will need machining.

Title: Re: When were ball check valves introduced on the injection pumps?
Post by: Shvegel on October 25, 2017, 02:14:17

Pretty easy machining.  just a cut in diameter.  15 minutes apiece max.