How do I properly align the IP to the engine? - PeachParts Mercedes-Benz Forum

Blake300D · #1 02-15-2017, 07:33 PM

I took my IP out to adjust and look over everything, but totally forgot about keeping it lined up. I have engine set at 26 degrees, but the pump has moved and I can't figure out how to get it back in properly

Thanks in advance

Maxbumpo · #2 02-15-2017, 08:00 PM

What year and model car?

On most of the 123 cars, I think there is a missing tooth on the splined shaft and a corresponding mark on the IP case that you align it with.

On the 1985 123 cars and 124 cars, there is a port on the side of the IP which is for a locking tool.

Blake300D · #3 02-15-2017, 08:15 PM

My car is a 1980 300d, and there isn't any missing splines. I looked several times. How exactly does the locking thing work? Would it still work if it is in the wrong location currently?

jay_bob · #4 02-15-2017, 11:02 PM

Check out this video, Dieselmeken explains how it works...there are 2 ways to time the pump, either matching a notch on the main shaft to a mark on the front end, or removing the timing plug and looking for the tab.
When you use the front mark it is 24 deg before TDC, when you use the tab, it is 15 deg after TDC.

https://youtu.be/WpAxhJDrYC4

Dan Stokes · #5 02-15-2017, 11:20 PM

Jay_Bob beat me to it. You'll have to navigate Goran's Swedlish (his English is WAY better than my Swedish!) but the info is spot-on.

Dan

Blake300D · #6 02-15-2017, 11:51 PM

I understand now. The sleeve was connected to the pump so I couldn't see the slot. And now the whole marking/degree situation makes more sense. Thank you !

Blake300D · #7 02-16-2017, 08:38 AM

Okay, so I must have timed it wrong. One cylinder will fire once in a while, but that's it. There seems to be a slight whitish smoke coming from the exhaust. I really thought I timed it correctly, but I guess not. Now I have to go to school, but I'll be back at it at about 3:30 lol

Diseasel300 · #8 02-16-2017, 11:13 AM

Make sure you are timing it based off of #1 cylinder on the COMPRESSION stroke. If you have it on exhaust you can get some "interesting" behavior. My SDL gained it's nickname of "Diseasel" due to the ENORMOUS white cloud it produced when running - the IP was timed off the exhaust stroke. It ran - sort of - and smoked and shook like hell. Maybe 2-3 cylinders firing.

Blake300D · #9 02-16-2017, 11:27 AM

I did make sure they were up, but something has to be messed up somewhere. I guess I need to disconnect the pump and start all over

Dan Stokes · #10 02-16-2017, 01:08 PM

Quote:

Originally Posted by Blake300D

I did make sure they were up, but something has to be messed up somewhere. I guess I need to disconnect the pump and start all over

Blake - Remember this is a 4 stroke Diesel and the piston comes to TDC twice during one operating cycle. I think the best way to assure that the engine is at #1 TDC is to pull the valve cover and make sure BOTH valves for #1 are loose when the timing mark is lined up - just grab 'em and wiggle. If they're not simply roll the engine around 360* and realign the mark so both valves ARE loose. I'll wager you're 180* off.

Then, you have to fight to get the air out of the system if you've opened any fuel lines (another PITA).

Dan

Blake300D · #11 02-16-2017, 08:52 PM

So I got it to run, but barely. Lots of smoke. Egts are really high just trying to keep it alive. I had it set too 26* with the can lobes up. I had the notch in the pump facing the top left screw. What else could possibly be wrong?

Maxbumpo · #12 02-17-2017, 05:34 PM

You've got the injection pump timing off by 180 degrees. We've seen this movie before....

Dan Stokes · #13 02-17-2017, 10:14 PM

Exactly what I was trying to say. The best way to be sure you're at TDC and not 360* out (remember, 720 * (2 revolutions) for one cycle) is to pull the cam cover and wiggle the rocker arms. That cam cover gasket is likely up for replacement anyway unless it was done recently. Removing the cam cover on our engines is pretty simple.

The injection pump is almost certainly 180* out - it runs at half crankshaft speed. So Max is right.

Dan

Blake300D · #14 02-19-2017, 04:16 PM

Okay, so. I really appreciate the info everyone, but something else must be off. I tried at 26* BOTH ways now. I tried 3 times with the lobes up and not touching the lifters. Then, just in case something was marked 180* off, I tried with the lobes down, and it didn't even try to fire this time. I'm getting really frustrated now

jay_bob · #15 02-19-2017, 06:54 PM

You have purged the air from the steel lines, right?

You have to "crack the nuts" at the injectors and let the injection pump push the air bubbles out of the high pressure lines. Otherwise the trapped air acts like a spring and won't let the injector pop open to release the trapped air and fuel.

Once the engine starts to fire you have to go around like a mad man and tighten the nuts back down so be ready.