Fixing up my MEP-803A"

[majoday]

Wow, 7 shims? I think that will make that pump fire off a little late. I've had a few sets that would smoke gray/white out of 1 cly. until it warmed up. They had probably 4 or 5 shims , removing a couple shims ( leaving 2 in place ) fixed most of them.

Sounds like someone may have owned stocks in the shim company! That's a whole lot of shims to be in one machine. I've never even seen gray shims, are those thicker than the black or somewhere in between the black and the paper thin green ones?
Glad to hear that it's running ( and sounding ) good now!

I listened to the motor yesterday. Using a hose, on the starter side of the motor, I put my ear to the sound of the head. # 1 and #2 were quiet. # 3 and #4 have a distinct compression knock. I am thinking that I need to increase the shim pack. But, before I do that, I wanted to run this by you because of the experience you have with timing through the shim packs. The other thing I think is the turning forward the injector pumps. However, In their current position, Temps were close across the 4 cyl's/

 

[Ray70]

You could try adding 1 more black shim to #3 and #4 and see if that changes the sound by delaying the injection point a few degrees.
I would not change the rotational position of your temps are pretty consistent. All that does is vary the amount of fuel delivered with each pulse.
A trick to help assess the situation, seeing as you have plenty of extra shims is to loosen the bolt and cut a slit in a shim so you can slide it in without removing the metering pump.
Tighten it down and retest. If it makes an improvement, then remove the metering pumps and replace the slit shim with a good one.

 

[majoday]

Mad me smile!! I really enjoy those moments that take thinking out of the box. Old mechanics have taught me some of their "out of the box" solutions. I will do that and let you know the results. Thank you very Much!!

 

[majoday]

You could try adding 1 more black shim to #3 and #4 and see if that changes the sound by delaying the injection point a few degrees.
I would not change the rotational position of your temps are pretty consistent. All that does is vary the amount of fuel delivered with each pulse.
A trick to help assess the situation, seeing as you have plenty of extra shims is to loosen the bolt and cut a slit in a shim so you can slide it in without removing the metering pump.
Tighten it down and retest. If it makes an improvement, then remove the metering pumps and replace the slit shim with a good one.

Hi! Some time has passed with other projects (Plumbing Challenge, trees down, etc.). Today I added the shims and all the cyls sound the same. Thank you for the info and insight!! Merry Christmas!!

 

[Guyfang]

The same to you!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!