Author Topic: Timing port on TDI plunger heads (Read 3876 times)

Justin · « **on:** December 02, 2006, 10:01:46 pm »

for those of you who would like to time your M-tdi's or check your regular TDI's stock timing and would like to swap out the timing port go to the parts store and by a 15/16 inch six point socket and round out 3 opposing sides. remove the timing port and put on an old idi timing port. the torque spec is like 45-55 lb-ft

later
Justin

nkb · « **Reply #1 on:** December 20, 2006, 09:13:05 am »

i always used a 1" open end wrench... this way sounds alot easier... great tip!

therabbittree · « **Reply #2 on:** December 23, 2006, 05:10:27 pm »

why do you need to swap em?...I've timed em fine with the cummins port its threaded the same ... as the idi and the tdi?
I just took my cummins pump apart and this part looks the same as the idi ..I checked the tdi and they look similar too..
Later,
Deo

deezul ryan · « **Reply #3 on:** December 23, 2006, 08:59:45 pm »

What is the timing port what does it do? why swap it?

therabbittree · « **Reply #4 on:** December 23, 2006, 09:57:21 pm »

the timing port is the small removeable bolt in the center of the plunger housing, its in the middle of the 4 delivery valve holders. The port allows a dialindicator to be threaded into the port to measure the plunger lift when setting you timing with a dial indicator. .. I am trying to find out why to swap it too,.... as both versions seem to be threaded the same ..mummn
Later,
Deo

deezul ryan · « **Reply #5 on:** December 23, 2006, 10:10:55 pm »

now i know what you mean. all that bolt does is fill the hole from leaking right? why swap it?

therabbittree · « **Reply #6 on:** December 23, 2006, 10:24:12 pm »

well its there to screw the dial indicator holder into thats all, it sealed with a copper washer to prevent the leaks.. I looked at my idi and cummins and tdi plunger ports and seem no obivous differance in this part, the plunger side of this port is different as it corresponds to the size of the plunger ie a perfect fit 12mm in 12mm 10 in a 10 9 mm in 9 etc... still you wouldn't be swapping that ... after you do a upgrade etc?
Later
Deo

RabbitGTDguy · « **Reply #7 on:** December 24, 2006, 02:57:20 pm »

The timing port from a cummins 12mm head has to be swapped to a TDI style one or a older IDI one if you want to use your stock VW timing tools. I had to do this on my cummins 4bt pump as the timing port access hole for the dial indicator that I had in particular was too large on the cummins pump "stock" as is. It was probably difference of 1-2mm and I could have made a bushing to allow me to adapt my dial indicator into the cummins port but why when I could easily swap in the TDI timing port and be done with it? This was the reason why in my particular case.

Joe

therabbittree · « **Reply #8 on:** December 24, 2006, 04:36:39 pm »

strange all my plungers head timing ports have the same thread as my idid timing tool?.. your timing toll won't thread in the cummins timing port?.. very wierd.. now i have soem timing issues still on 2 of my cummins pumps that i have .. the one piers pump shop did and one i just did last week. both when locked and set at tdc have the pump off when you spill port test it it spill ports about 30-040 degress past tdc..and whe n you use the idi timing tool it will not drop any of the 2.5 mm preload off th edialindicator ..meaning it is on a flat of the cam plate when locked with the pump pump pin..argh.. i may have to make a new pump pulley with a new lock location..when the cam plates are removed and compared to a regular idi its the same spot for the plunger set pin and the pin is on a lobe of the cam plate, and the pin is lined up with teh pump shaft slot fro the wooddruff key and wood druff key is up and toward the head cyl head when at tdc #1 cyl, so it should time the same but it doesn't ..very weird.. one of the pumps is fine times just like a idi and two of em are the way i described above..its annoying an i still haven't gonna to the bottom of it.. any ideas?
Later
Deo

RabbitGTDguy · « **Reply #9 on:** December 25, 2006, 09:21:02 pm »

No, on both the cummins pumps that I have messed with, both the timing pots on the back of the head had larger diameter timing ports that would not allow my IDI timing indicator to screw in...short of having an adaptor of some sort made, etc. Was the same way on both the pumps.

As for timing, my was pretty straight forward after I did the internal swap parts I needed to, etc. To obtain TDC and the correct positioning of the adjustable pump sprocket I used before intially doing the timing I brought the pump to #1 simply by turning the pump so that the woodruff keyway on the pump shaft aligned with the slot in the front casting of the pump that indicates #1 in the sequence. I checked this against the old IDI pump sprockets I have as well as the IDI pumps and found all the VE pumps to be setup this way. Really easy. From there, timed the engine intially, aligned my later model TDI sprocket hub and adjustable sprocket against the IDI pump mark references and finished the belt process. After that my dial indicator seemed to work fine (with the except of the fact that it is SAE measurements which meant I had to convert, which I need to get a nice long travel metric unit), and found the adjustment that suited the car and I the best. For the moment...
Probably will change with the injector upgrade and other pump upgrades this winter, probably will rebar the injectors too if I can find a shop to do it around here...

Joe