om606 "new" rescue with an engine problem - PeachParts Mercedes-Benz Forum

jake12tech · #1 05-28-2018, 10:21 PM

Lord help me. I'm saving another e300 I got for pennies to the dollar. Another 98 with 140k and 240k on motor. The car is rusty, but a good beater if I can do it cheaply and I don't have to subject any of my cars I've gone to deep measure to fix the PA rust.

Story: First motor hydrolocked a cylinder from a bad fuel pump according to P.O. I'm assuming he means the injection pump overfueled it from some malfunction from a delivery valve fault. Junkyard motor swapped an engine and IP on a chance with 240k.

Swaps "new" engine and fires it up and cylinder 4 sprays a mist of compressed air and fuel and gives up on car and further diagnosis. Assumes it's a bent valve or bad head. I disagree with both because at 240k the motor is too young. How is it going to just bend a valve and not multiple? it's an interference engine with companion cylinders so I'd think it's companion cylinder would bend valves as well.

I started the car and it seemed to run ok. I didn't run it long enough not having the top bolts in the motor mount and no coolant. I didn't get a chance to notice the mist and air, and didn't notice extreme amounts of white smoke pouring out of the exhaust or a dead mis.

Advice and your ideas as well? Possible sunk lifter from clogged gallery? or stuck valve from soot?

jake12tech · #2 05-29-2018, 07:26 PM

hmmm bump. 60 views and no fdpliez is weird

ROLLGUY · #3 05-29-2018, 09:40 PM

I'd say put coolant in it and run it. You could also do a compression check, that would tell you the condition of the valves. Other than that, I am clueless.

dude99 · #4 05-29-2018, 09:46 PM

Quote:

cylinder 4 sprays a mist of compressed air and fuel

Where does it spray out of?

jake12tech · #5 05-30-2018, 11:48 AM

Quote:

Originally Posted by ROLLGUY

I'd say put coolant in it and run it. You could also do a compression check, that would tell you the condition of the valves. Other than that, I am clueless.

That's what I'm thinking. if the damage is done, it's done and won't hurt anything more. My diesel compression test kit for the 606 is on loan. I have a HF kit, I wonder if it works on the 606 as well?

Quote:

Originally Posted by dude99

Where does it spray out of?

One of the intake ports. Excuse my vagueness.

jay_bob · #6 05-30-2018, 12:53 PM

Well that doesn’t sound too good. Intake valve should be closed before compression and injection.

You may get one shot out of the HF kit after reading the experiences in the other thread...

ROLLGUY · #7 05-30-2018, 10:17 PM

It could be just a burnt valve. A head rebuild will fix that (as you probably already know).

jake12tech · #8 05-30-2018, 11:04 PM

Quote:

Originally Posted by jay_bob

Well that doesn’t sound too good. Intake valve should be closed before compression and injection.

You may get one shot out of the HF kit after reading the experiences in the other thread...

I actually used it success on my 87 300D before. It's not so bad. Sometimes the Schrader valves need to be replaced.

Quote:

Originally Posted by ROLLGUY

It could be just a burnt valve. A head rebuild will fix that (as you probably already know).

I wonder. The guy said it sprays a mist of air and fuel but doesn't misfire and it didn't misfire for me either. What are the symptoms of a burnt valve?

ROLLGUY · #9 05-30-2018, 11:14 PM

A burnt valve will make a popping sound from the intake port.

jake12tech · #10 05-31-2018, 11:32 PM

It's extremely air bound and I gave up because I have to borrow a very good battery pack to jump it cause a car isn't able to sufficiently jump it.

I feel like if this car truly had a valve issue it would be heard when t's cranking over. It cranks very healthy and strong and on six cylinders and runs without a misfire. correct me if I'm wrong. I don't have much experience with internal engine problems.

Diseasel300 · #11 06-01-2018, 09:09 AM

If you're having air AND fuel spraying out, about the only place that's gonna happen is going to be the injector. If it's just air and "whatever" spraying out of one of the intake runners, it's a valve/valve seat.

jake12tech · #12 06-03-2018, 12:07 AM

^^^ I started it up again and boy was it not happy! Misfire and compressed air and fuel spray! cylinder 3 is the culprit!

I'm not sure how this car ran ok the first time I ran it. For maybe a minute, but the intake valve is whooped. It does not sound bent, no metallic noises or anything. I'm assuming a cracked valve. I'll upload a video to YouTube and share it.

I plan to continue this and fix it with my amassed parts for the 606.

Next project is pull the head. The car is so clean it's too difficult for me to put it down.

jake12tech · #13 06-03-2018, 12:17 AM

https://youtu.be/Vg7DJYkfoxU

jay_bob · #14 06-03-2018, 07:44 AM

Yeah that's not how it's supposed to sound...

YouTube popped up the next suggested video, it's our friend from Sweden...the comment at 2:19 about had me fall out of the chair

https://www.youtube.com/watch?v=47s2l9_60qk

jake12tech · #15 06-14-2018, 12:52 PM

Well I pulled parts off it after pulling the head Sunday and to find piston to valve contact. Sold it as a parts car for $300 more than I paid and kept the glow plug relay and the wheels with new tires on it. Guy wants to try and rebuild the 606 he said. I don't think he comprehend it won't be as cheap to build as a SBC.