Author Topic: Quick timing question, Please Help! (Read 5603 times)

boosted_diesel_84 · « **on:** November 22, 2007, 09:04:45 am »

hello, and happy thanksgiving! i am trying to time my pump today after putting a new belt on, cam ,crank and pump are all lined up perfectly, i am going by my bently for checking and adjusting pump timing, but i am confused, it wants me to screw the dial indicator in until 2.5 mm, which i did with motor on TDC, i turned it counter clockwise like it said, then i turned it back clockwise until TDC, but in my book it now says readjust dial indicator so you can zero it w/ a 1mm preload, what does this mean? i thought i was susposed to have 2.5mm on it? i am confused,i am sure timing is off, because i bought the car from a bunch of hillbillies that messed with it that shouldnt have, and it runs rough at idle and smokes whiteish gray at start up the car in question is a 82 rabbit, i would appreciate any help, thanks!
-Jack-

jimfoo · « **Reply #1 on:** November 22, 2007, 09:09:17 am »

Preload to approx 2.5mm at TDC, turn engine counter-clockwise until needle stops moving. Zero needle, rotate to TDC, lock pump sprocket and cam. Rotate pump for desired reading and tighten bolts.

boosted_diesel_84 · « **Reply #2 on:** November 22, 2007, 09:11:41 am »

thanks for the quick reply, i will go out and try this now, thanks!

boosted_diesel_84 · « **Reply #3 on:** November 22, 2007, 09:21:21 am »

ok, just tried with no luck, my dial indicator is standard units, and 2.5 mm converts to .0984, so i put the dial just before 1 whole turn, locked it in place, turned motor back,zeroed gauge, then foreward to TDC, and it never moved, what am i doing wrong, sorry, this is my first time, thanks for help!
-Jack-

boosted_diesel_84 · « **Reply #4 on:** November 22, 2007, 09:38:29 am »

ok i tried it a few more times, and now it moved, from the zero it went to .01 in. on TDC which is .254 mm, so i need to adjust my pump? do these numbers even sound right to anyone? because dont i want 1mm +/- .2mm? thanks for any help!
-Jack-

jimfoo · « **Reply #5 on:** November 22, 2007, 09:39:24 am »

By zero, did you just rotate the dial to 0 or slide the gauge out until it reached 0? It basically needs some preload on it with the dial rotated to read zero so that it has room for movement.

boosted_diesel_84 · « **Reply #6 on:** November 22, 2007, 09:44:24 am »

i just rotated dial to zero

boosted_diesel_84 · « **Reply #7 on:** November 22, 2007, 09:48:23 am »

ive tried preload of 2.5mm on TDC, rotate back, but the dial never goes down, it just stays where its at, then i zeroed it, and put it foreward to TDC, and only once in 5 tries did it move off of zero, and it went up to .010 in

jimfoo · « **Reply #8 on:** November 22, 2007, 09:48:37 am »

Quote from: "boosted_diesel_84"

ok i tried it a few more times, and now it moved, from the zero it went to .01 in. on TDC which is .254 mm, so i need to adjust my pump? do these numbers even sound right to anyone? because dont i want 1mm +/- .2mm? thanks for any help!
-Jack-

You want approx .040-.041"

jimfoo · « **Reply #9 on:** November 22, 2007, 09:51:58 am »

From TDC, it should go down when the engine is rotated CCW. If not, something is sticking or the pin for your dial gauge isn't long enough for some reason, but if you are able to pre-load it, that doesn't sound like the problem.

boosted_diesel_84 · « **Reply #10 on:** November 22, 2007, 09:57:50 am »

ok, just tried again, this may have something to do with it, the set screw on the bar that threads into the pump, for it to hold on to the dial indicator shaft that is fixed on dial, it must be in so far that the dial goes around 3 times! otherwise the set screw pushes on the indicator shaft and wont allow it to move. how can i get around this to make it work? can i have that much more preload, the kit i have is susposed to be for vw diesels.

jimfoo · « **Reply #11 on:** November 22, 2007, 10:02:31 am »

You can have a lot more pre-load, that is fine. The pre-load is just to make sure there is enough movement in the gauge so it doesn't bottom out.

boosted_diesel_84 · « **Reply #12 on:** November 22, 2007, 10:04:01 am »

ok, cool, i will go try again for the 8th time, lol. thanks for the help!
-Jack-

boosted_diesel_84 · « **Reply #13 on:** November 22, 2007, 10:18:03 am »

ok it is finally working, timing is off, its at .034 in. and it needs to be around .040 in. correct? i loosened all 4 bolts, now do i push the pump toward radiator or engine, and do this by hand or what? because it seems like it doesnt have to move much and i would hate to go too far and mess it up worse. thanks!
-Jack-

jimfoo · « **Reply #14 on:** November 22, 2007, 10:20:37 am »

Just turn it until the dial goes up to .040". It doesn't take much movement. I don't remember which way to turn it, but if it goes down, turn it the other way.