Solenoid style KSB valves

[surfcam]

This topic has come up twice in the last few days. Anyway I have the Troubleshooting and Repair Manual B Series Engines 1991 and 1994 Certification Levels. In it, it has trouble shooting for the valves. The valve on the 3.9 Cummins Bosch pump is 12volt operated from a thermal switch in the water jacket. When the thermal switch reaches 90F the solenoid opens and it retards the timing. It does this by bleeding some of the diesel back to the vane pump there by lowering the gallery which will cause the IP to retard the timing. I'm thinking that this set-up is on a lot of pumps. Very easy to trouble shoot all you need is a volt meter and maybe take the solenoid out to see if it's working.

[VW cat]

I've got an '05 Iveco engine with a Bosch rotary pump. Lacking a service manual, I was puzzled as to the purpose of a small solenoid valve located in the side of the pump head. Do you have a picture of the valve your referring too?

[TylerDurden]

Two common versions of the side mounted solenoid do quite different things: one has a tube going to the pressure regulator for dynamic timing, another has a tube going to the boss above the governor shaft for the ALFB disable.

ksb:
http://i290.photobucket.com/albums/ll27 ... IM1799.jpg


ALFB:
http://www.vwdiesel.net/forum/index.php?topic=34760.0

[surfcam]

oops SORRY I guess I started reading wright in the centre of the trouble shooting chapter. A pictures is a 1000 words right so that's were I started right at the pictures. It looks like VE pumps with automatic advance have a KSB valve. Well maybe on some of them. This valve takes the place of the pressure regulator valve (a spring loaded slider valve) on the regular pump. If your pump is pree 91 then your going to have the wax motor KSB installed. Clear as mud. Well maybe next week I'll try a post some this. I'm retired so I'm very busy. I have to set up 30 by 10 foot space at the toy show in Lethbridge AB.

[TylerDurden]

I wouldn't say the KSB ever replaces the regulator, but might work with it, when the solenoid or waxmotor are in play.

Bosch had a number of cold-start schemes, any of which might be called KSB.

[surfcam]

I wouldn't say the KSB ever replaces the regulator, but might work with it, when the solenoid or waxmotor are in play.

Bosch had a number of cold-start schemes, any of which might be called KSB.

From looking at schematics draws it appears that the IP with the KSB has a different pressure regulator valve. I would be a lot better for me if someone would just come over and read the whole 93 page fuel section of this book. And maybe post some pictures. I'm just 18 km north of Sweet Grass MT. I don't think that's going to happen even though I do have the coffee on. So maybe next week I'll try and post something. It's loading day today. I wonder how many different KBS schemes are out there.

[VW cat]

Thanks for the info. I'll try to attach a pic of my pump.

[surfcam]

That IP looks like it from Bellville. The poor thing looks like it lost a lot of metal. The year of car that the IP was on can help to figure out what style KBS you have. I really have no idea if this Cummins manual that I have will apply to VW 1.6's. I'm just guessing that it does. But I'm sure with the help of other member we can shed some light on the subject. Because it's a top view of the solenoid or waxmotor I can't tell what it is. So is it the same length as your fuel shut-off?