Doesn’t matter. I have a simple light that has no tachometer on the light and it works great. I believe your 4-6-8 setting is to get the tachometer calibrated correctly on lights with digital tachs.

I have a Sealy. It puts out a pulse whenever it detects a peak on the injector tube. The pulse is picked up on the light which gives a flash. It’s that simple.

I forgot my numbers but I recall using the advance shown in these threads. Lemme look it up in my notes. 19 degrees. Did the same on my 300sd and 300d. They run great.

I got to use my dad’s old craftsman timing light. He splurged and got the “Sears Best” model in 1982. I grabbed it out our garage in Altadena back in 2021. It’s one of the few tools I saved from the big fire because it lives in my garage in Irvine. It’s cool that it got a second life as a diesel timer. I thought it was old trash till I realized it could be used with the Sealy. Really well made when Sears was good stuff.

https://www.racingjunk.com/news/wp-c...7/Timing-2.jpg

For the curious here is the board in the sealy. The piezo signal is amplified and sampled by an Atmel microcontroller. I believe some adaptive filtering is done to get rid of the false triggers. Then a single pulse is generated and this is sent to another amplifier that makes a small current flow in the loop of wire the clip attaches to. It’s pretty simple but I must say it’s well worth the $150 I paid for it. Makes timing a breeze with no guesswork.

https://live.staticflickr.com/65535/...be296615_c.jpg


Yikes. My memory is going. Here is my post after I dialed in my SD. Apparently the idle advance is quite different than the advance at 1000 rpm.

https://www.peachparts.com/shopforum/4205139-post34.html

Well looks like the IP is shiat.... now back to delivery valve 3-4 not popping any fuel out. Was the problem at first....... cleaned all the delivery valves.... things started working.... now they are not pissing any fuel out of them again.

mucho gratuitous.

ordered one cause all the used ones near me had no RPM..... so would have to buy a laser tach....... and even used by time got them both...... it be more than a new Chinesium Amazon one wtih tach built in

But that is all four Naught........ IP is FUBARED

Yeah I read your post. That’s the pits. The good news is the junkyard is full of pumps. They are pretty robust. Just pull one and toss it in.

ETA - bugs crawled in your lift pump? I kind of recall the car pushes fuel through the filter using the lift pump. Maybe my recollection is wrong. I thought there was a filter between the lift pump and IP. Need to check the diagrams

engine was not fully installed part of the time I had it. bought it in a unfinished project car..... Later was on the ground under tarps after I removed it. dirt daubers found every small orifice to build nest... like the line to the mechanical pump. didnt catch all of it I guess. (cleaned a lot out before hand) yet still ended up with larvae parts floating in the new primary fuel filter. Thought got lucky. and that spot the filters would catch stuff.

That's only explanation can come up with... have got a video of this rebuild running in the machine shop who built it