No - a tap is not needed

Posted by jdemaris on April 29, 2005 at 06:51:03 from (209.23.30.175):

In Reply to: Re: Diesel timing light adaptor posted by txgrn on April 29, 2005 at 06:08:01:

I'm not sure I fully understand all of what you're saying or asking. In regard to the "instructions" for building the unit - it doesn't look right to me either since the guy mentions a solenoid which does not exist in mechanical injection.
In regard to whay you say about "having the engine off to set the pump", you've totally lost me there. Many pumps can have their fuel delivery adjusted, and measured with the pump intact and on the engine. I've done many. But, I'm trying to find a way to check the initial timing on a mechanical injection diesel. Usually, with most pumps, there are timing holes are marks that provide initial (unadvanced) timing marks. The problem I've encountered several times is due to two situations: First - pumps mounted in such a way that the timing lines on the pump are not visible when it is installed, and number two - mainly with Roosamaster/Stanadyne pumps - sometimes the governor weight retainer ring gets replaced without being marked. When new, out of the box, they have no timing marks. They come this way so they will fit all pumps. The installer is supposed to stick it on a degreed chart, and mark it for the particular application before installing it. I've come across many that were never marked.
As far as what you mention about needing a tap to sense injection - that is NOT true. For years, there has been an adapter available for mechanical injection that hooks to a conventional gas-engine type timing light. It simply clips over the injector line. It uses a Piezo pickup, but I've never seen a schematic so I don't know for sure exactly how it works. As I mentioned in my first post, they cost $200-$300. Ferret makes them, and other companies sell them under their own name including Snap-On and OTC.

Follow Ups:

• Re: No - a tap is not needed Jerry/MT 11:03:54 04/29/05 (0)
• Re: No - a tap is not needed the tractor vet 10:04:20 04/29/05 (0)
• Link to URLs for the tool jdemaris 07:05:49 04/29/05 (0)

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