OM606.910 project, glow plugs, bio and boost - Page 2 - PeachParts Mercedes-Benz Forum

bigpanda16 · #16 07-30-2017, 04:34 PM

Right on, I did notice a certain ease and willingness of the plugs I could hit straight on with a 3/8" impact to almost "jump out"
I have had 2/300tdi plugs break on me before but it is rare, perhaps 3-4 out of scores and scores. Mostly I think when people don't tighten or cinch the, down enough because they are perhaps scared they will be too tight or hard to extract next go round. That allows the carbon to creep up past the sealing seat.

On another note, I was initially apprehensive about the 602.962 since it was a clean body in the junkyard. The guys who worked there(or someone before) stripped the oil drain plug, so they drilled two holes in the oil pn to drain the oil. I tapped them to 1/8-27 npt and stuck plugs in. Burnt up the starter trying and trying to bleed/get it to fire. Checked fuel output at injectors and it was a drizzle so i stuck on the new fuel filter from the 606 and she hit right away and revved well and clean. The camshaft lobe visible was perfect which indicates that its been maintained to a certain extent. The turbo was however locked up. Usually when they go bad they exhibit lots of play.
My theory of why the car got junked is that the vacuum system ceased to actuate the boost of the turbo, loss of power, perhaps they chose to continue to drive it a long time after that. Carbon soot caked and built up in the exhaust housing freezing the blades of the turbo. I was initially thinking of buying a Chinese t25/28 knock-off or rebuilding this one. After cleaning out all the carbo the turbo feels great and spins easily. The fuel filter clogging must have eventually slowed it down or made it cease to run, maybe then it got junked... Who knows

ROLLGUY · #17 07-30-2017, 06:27 PM

Interesting 606 turbo engine. I have never seen one with mechanical accelerator or non-itntercooled. That seems to be the one to have for an engine swap project.

bigpanda16 · #18 08-01-2017, 07:49 AM

So the exhaust side of the 606 cleaned up alright, drilled and tapped 1/2" npt for an10 oil return.

bigpanda16 · #19 08-01-2017, 07:51 AM

And the 602 is back together, turbo spins up freely with boost actuated wastegate swap and egr blocked off

Maxbumpo · #20 08-01-2017, 11:27 AM

Quote:

Originally Posted by bigpanda16

But I look at the gear closer and literally every tooth on the front was wiped out so the injector pump is essentially single chain driven now.

My question is how did this wear happen? I see damage to the chain as well as the timer gear teeth worn nearly off.

Have you checked the camshaft gears and the crankshaft gear? Installed a new chain?

bigpanda16 · #21 08-01-2017, 01:13 PM

Well I wouldn't call it wear, exactly, especially since the rear row of teeth look perfect. It looks more like a series of unfortunate events that ended with a bolt laying against the front cover and chain guide which literally almost wiped out every single tooth up front. I have spun the motor all around and visualized the crank gear as well as the cam gear and the chain and they all look good as far as I can see.

bigpanda16 · #22 08-12-2017, 08:14 AM

So, I've been slowly working on these motors, the vacuum pump on the 602 did not have a caged bearing and I swapped it for one that does. The timing chain on the top and bottom of the timing device/pump gear sprocket was tight and not easy to move on the 602, but when I felt it on the 606 it was so loose that I feel I could almost pull it off and out of time.
So I've decided to bite the bullet.
I will pull the front cover and replace the gear as well as all chain, rails and tensioner.

Also the 602 head gasket is weeping coolant out of the back right-hand side so ill go ahead and slam a head gasket onto it. I will try to do it without pulling the cam/lifters or exh manifold

Ian White · #23 11-18-2020, 06:49 PM

Reviving an interesting thread: did this get completed?

bigpanda16 · #24 11-19-2020, 10:04 PM

Nope, I made the damn fool mistake of storing it with the intake manifold off of it. Some rats had a huge party all along the ports, filled one with piss and general crap and rubbish everywhere else. I need to pull the head and clean it all up and check the cylinder that has open valves.
I did recently aquire a 95 e300d that I intend to pull the pan and drill and tap the block for a 3/4" npt oil drain. So the he351 n/a-t dream is still alive, but I've been messing around with my wife's new 300sdl and simply enjoying putting around in my e300d.
Also I scored yet another backup 606.910 but it seems to need head work as well as two exhaust ports are oily not sooty

Won24 · #25 07-07-2021, 01:57 PM

I must ask. The HE351 you plan on using, is it the variable geometry turbo (e.g. HE351VE)? I have a 95 W124 OM606.910 and I am debating doing something similar to it.

Sorry to hear the rats got to it. Don't be too hard on yourself, it wouldn't have been a problem if these engines weren't so cozy. ��

As for the valve seat issue you mentioned earlier. I wonder if mine has this issue. Every once in a while (maybe 3-4 times a month running it every day) I will start it, it kicks over and starts easily, runs great for about 5-10 seconds then starts missing and making smoke, then goes back to normal about 5-10 seconds later. I also have a touch of nailing from 700-1.1k rpm with a warm engine. It has ~260K miles on it and I suspect the timing needs some adjustment. Initially I thought the smoke/miss was an injector getting stuck open for a bit, but now I am wondering if she needs headwork.

Murkybenz · #26 07-08-2021, 03:03 AM

Quote:

Originally Posted by jake12tech

Everybody does the glow plugs the hard way. I can do them in 25 minutes start to finish. It's a 1/2 impact gun on low setting and your compressor turned down. Never snapped a plug and done it 4 times and walked a member through the process and he didn't break any plugs either. My time is more valuable than hours chipping away and hoping and praying.

I have had a couple out on a 606 I once owned and both of these had to come out slow ,turning back and forth and one of them for nearly two or more hours to get it out despite plenty of lube it squealed constantly even on part turns.... both of these when rolled on a flat surface were bowed and an impact gun would have broken the head off of them