[Vwdiesel] .85mm or 1.15mm IDI injection pump timing? The facts...

mark shepherd mark at shepher.fsnet.co.uk
Thu Jul 7 02:32:11 PDT 2011

Loren's correct about the timing figures. The 107A pump was only officially 
put on vehicles around 1980. Apart from this pump, [and in truth including] 
all unremanufactured pumps should be set to 1mm as a start, and then because 
of general wear, internal spring weakening, affecting both internal 
pressures and dynamic advance rate, and  fuel changes. Overall engine 
condition also affects, as well as injector condition, and especially 
injector break pressures.
 The only way to get it right on the side of the road, is to run it and then 
tweek the pump into advance  or  retire from this starting point. 
Improements can be found by ear, touch [vibration checks through gear stick 
when accelerating], periodic fuel economy changes etc on on otherwise 
similar journeys.
Use the dial gauge to make notes of where you are and how to get back there 
when you find the motherelode was the last position.
Timing is not tuning


----- Original Message ----- 
From: <LBaird119 at aol.com>
To: <vwdiesel at vwfans.com>
Sent: Thursday, July 07, 2011 5:43 AM
Subject: Re: [Vwdiesel] .85mm or 1.15mm IDI injection pump timing?

> In a message dated 7/6/2011 3:53:30 P.M. Pacific Daylight Time,
> newdarkages at yahoo.com writes:
> attempted to search the archives but i couldn't find anything  specific :(
> i remember there were 2 common settings for setting the  timing in the
> Bosch VE
> injection pump which was fitted in the IDI diesel  VWs. the stroke 
> settings
> i remeber having timed were .85mm and  1.15mm.
> when you have an engine out of a different car or you are  changing the IP
> how do you find out which timing stroke is the appropriate one  to use?
> is there a chart or a range of part numbers?
> also which timing  did the Turbo IPs with the altitude compensating
> addition use?
> tank you  for clarification!
> If the VW part number on the pump ends in "107-A" then it's a  "Yellow 
> Dot"
> pump
> and times at 1.15mm.  Others time at .85, .95 and 1.00mm.  Post  those 
> last
> digits
> of your part number and we'll dig up your correct timing.  The first  part
> of the number
> is 086-130-_ _ _ - _ I think.
>    Loren
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