drip, drip, drip, NOT... IP timing...any ideas? - PeachParts Mercedes-Benz Forum

gdemoss01 · #1 10-12-2007, 12:51 PM

1980 300 SD

OK, I timed the valves, installed new injectors, all of which resulted in a LOT of white smoke and difficult starting.

Therefore, attempted to time injector pump to reduce smoke and improve starting.

Checked chain stretch: 2 degrees, not real significant.

Drip method: no matter the position of the pump with throttle wired open and shutoff vacuum disconnected all I get is constant flow of fuel to no flow--no drips in between at all.

Am I missing something here? Any suggestions would be appreciated.

Oh, and I am mechanically challenged BTW, and I'm loosing all my hair over this.

Thanks.

#2 10-12-2007, 12:52 PM

Do you have the crankshaft set at 24* BTDC on the #1 compression stroke?

winmutt · #3 10-12-2007, 02:11 PM

You are using a drip tube correct? How did you measure cam timing (aka chain stretch?)

Quote:

Originally Posted by gdemoss01

1980 300 SD

OK, I timed the valves, installed new injectors, all of which resulted in a LOT of white smoke and difficult starting.

Therefore, attempted to time injector pump to reduce smoke and improve starting.

Checked chain stretch: 2 degrees, not real significant.

Drip method: no matter the position of the pump with throttle wired open and shutoff vacuum disconnected all I get is constant flow of fuel to no flow--no drips in between at all.

Am I missing something here? Any suggestions would be appreciated.

Oh, and I am mechanically challenged BTW, and I'm loosing all my hair over this.

Thanks.

gdemoss01 · #4 10-12-2007, 02:50 PM

I've tried the marker on the flywheel anywhere from 26 degrees to 22 degrees BTDC: no difference in lack of drip no matter where I position the IP.

I know the stretch in the chain from the markers on the cam and cam tower and looking at the flywheel and it shows approx 2 degrees ATDC.

I just tried it again, no difference so I put the IP back o approx where it was and turned the engine over. It acted like it wanted to start, but then did not. I'm losing my grey hair rapidly.

Anyone, plaintive cry for suggestions, help....

winmutt · #5 10-12-2007, 03:49 PM

Quote:

Originally Posted by gdemoss01

I've tried the marker on the flywheel anywhere from 26 degrees to 22 degrees BTDC: no difference in lack of drip no matter where I position the IP.

I know the stretch in the chain from the markers on the cam and cam tower and looking at the flywheel and it shows approx 2 degrees ATDC.

I just tried it again, no difference so I put the IP back o approx where it was and turned the engine over. It acted like it wanted to start, but then did not. I'm losing my grey hair rapidly.

Anyone, plaintive cry for suggestions, help....

The only absolute way to check cam timing is via 2mm lift method.

Have you verified it is at TDC? Cam lobes should be out and up on cyl 1. The balancer could be on backwards? Perhaps try more aggressive measurements? (20/28 degrees?)

jbaj007 · #6 10-12-2007, 03:53 PM

Did you remove the delivery valve and spring from the #1 at the IP?

FWIW

gdemoss01 · #7 10-12-2007, 04:39 PM

Yes, I took out the delivery valve and spring, disconnected the vacuum at the shutoff on the IP, and wired the accelerator at full open.

As for checking TDC, I was just going by the flywheel marker and aligning the cam with the cam tower. and I don't know enough to know another way of checking TDC

I would add though that the cam lobes are NOT pointing straight up. As I recall the second one (from the front) was about 25 degrees before straight up and the first one was about 25 degrees after straight up. Where should the be on a 617 engine at TDC?

gdemoss01 · #8 10-12-2007, 09:24 PM

Quote:

Originally Posted by gdemoss01

Yes, I took out the delivery valve and spring, disconnected the vacuum at the shutoff on the IP, and wired the accelerator at full open.

As for checking TDC, I was just going by the flywheel marker and aligning the cam with the cam tower. and I don't know enough to know another way of checking TDC

I would add though that the cam lobes are NOT pointing straight up. As I recall the second one (from the front) was about 25 degrees before straight up and the first one was about 25 degrees after straight up. Where should the be on a 617 engine at TDC?

anyone have any ideas about the cam lobes?

ROLLGUY · #9 10-12-2007, 11:02 PM

I would add though that the cam lobes are NOT pointing straight up. As I recall the second one (from the front) was about 25 degrees before straight up and the first one was about 25 degrees after straight up. Where should the be on a 617 engine at TDC?

It sounds like the cam is correct. If it was 180 deg off, one of the valves would be open. The valvs just need to be closed. If the car was running before, and the IP has not been removed, then it should be within the adjustable limit of the IP. I did the drip method of start of delivery on my 300CD, and it worked fine. It sounds like you are doing it correctly. I am baffled at your situation, sorry I am of no help.

Chas H · #10 10-12-2007, 11:25 PM

Please expand your comment that you "timed the valves". What did you do?

gdemoss01 · #11 10-13-2007, 10:16 AM

Quote:

Originally Posted by Chas H

Please expand your comment that you "timed the valves". What did you do?

Maybe I used the wrong term. I just set the valves to .035 and .004, exhaust and intake. They are set to the proper clearance.

I'm still mystified that I get no drip at all no matter where I position the injection pump but simply a flow while using the aux. pump and then the flow just stops.

Even worse though is the fact that the engine will NOT start at this point.

Thanks for the suggestions....

larry perkins · #12 10-13-2007, 01:26 PM

would you mind telling us why you was working on the engine in the first place?
larry perkins

Stevo · #13 10-13-2007, 01:34 PM

Did you disconnect the vacuum line to the shut off on the IP?

gdemoss01 · #14 10-13-2007, 05:58 PM

Quote:

Originally Posted by larry perkins

would you mind telling us why you was working on the engine in the first place?
larry perkins

I was working on it, mentioned I think in my first post, because after replacing injectors due to nailing (and I didn't know how many miles they had on them) and adjusting valves (it was time to after 15k miles) white smoke started appearing, especially when first starting. Moderate white smoke continued even after attaining running temps.

My feeble mind concluded that IP timing must be off after new injectors.

And yes I did disconnect the vacuum to the shutoff and wired the throttle open.

It still won't start.

Thanks.

larry perkins · #15 10-13-2007, 06:13 PM

shouldnt exhaust be adjusted to .014 in
larry