Originally Posted by 93goatfucker04
Any of you smart people know what a KSB valve on a diesel does/stands for? I cant find a definition in the manual and internet results are sketchy(read:I suck at it) Is it really the cold start accelerator
Its some German word that loosely means Cold Start Advance. It increases the timing a few degrees by putting extra pressure on the advance piston. The later 1st gen trucks use a solenoid that actives by a manifold sensor. When the manifold < 90F it activates. Where users have advanced their timing to get better performance, etc. the KSB doesn't have as much effect. On a stock truck the difference in the engine is very noticable.
The KSB restricts the pump return, which raises the case pressure at low RPM. There is a limiting valve to prevent case pressure from getting too high. With the KSB off, case pressure is low at idle and rises with RPM. When the case pressure goes up, the timing is advanced. The KSB uses the same mechanism to advance the timing, it just makes it work at idle instead of being RPM dependent.
KSB is short for KaltStartBeschleiniger
In English that's "Cold Starting Aid" or words to that effect.
The textbook answer is this: KSB is a kalt-start-beschleuniger. German for cold start accelerator. It takes a signal from a temperature sensor in the manifold to actuate a solenoid (may be an electric solenoid post-'92 or a thermal wax pre-92) which redirects fuelpressure into the injector pump. This increase in internal pressure in turn bumps your timing (5degrees?) to smooth out the chilly beast on those cold mornings. The temp sensor will cut power when manifold temp reaches 90 degrees F.
The KSB is located towards the bottom of the injector pump. 2" long x 3/4" cylinder, electrical terminal on one end, a fuel outlet in the middle.