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  #1  
Old 04-12-2019, 11:08 PM
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w124 m104 need help again

i got everything bolted back together from a head gasket change..fill the fluids..start the car. runs and sounds like absolute ****. leaking coolant from somewhere on the back of the engine ..but not the heater hose, hooked up a vac guage its oscillating from 2-5hg. feels like its only running on 3 cylinders. idles at 800 and revs up pretty quick when you give it gas. no codes..no backfiring..no smoke

ill run a compression check but it kinda seems like i f-ed up my head gasket repair somehow. everything went together smoothly im a lil disappointed and a little bit frustrated

actually it looks like its only leaking from that o-ringed water line under the thermostat. so thats an easy fix.

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Last edited by speednjay; 04-12-2019 at 11:57 PM.
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Old 04-13-2019, 01:04 AM
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Thanks for sharing?
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Old 04-13-2019, 01:07 AM
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check the coils for correct orientation1/6 2/5 3/4 has the correct way on the cover
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Old 04-13-2019, 01:15 AM
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Quote:
Originally Posted by nulu View Post
check the coils for correct orientation1/6 2/5 3/4 has the correct way on the cover
I swapped them around with some spares I had. No change. Exhaust smells rich.


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Originally Posted by INSIDIOUS View Post
Thanks for sharing?
Was just asking for help/ ideas on how to fix my car
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Old 04-13-2019, 01:20 AM
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It almost sounded as if you solved with the last line "actually it looks like its only leaking from that o-ringed water line under the thermostat. so thats an easy fix. " but maybe not.
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Old 04-13-2019, 03:08 PM
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What would cause the back 3 cylinders to not fire? I started the engine cold and checked the exhaust ports for heat. Cylinders 4 5 6 are ice cold while 1 2 3 quickly heated up.
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Last edited by speednjay; 04-13-2019 at 04:19 PM.
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Old 04-13-2019, 05:51 PM
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Perform a compression test before further diagnosis
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Old 04-13-2019, 07:06 PM
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Cylinder 6 has zero compression. Guess I need to do a leak down test now to figure out exactly what’s going on. Maybe a valve got damaged somehow?
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Last edited by speednjay; 04-13-2019 at 07:57 PM.
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Old 04-15-2019, 10:52 AM
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How did you time? did you verify the positions of the cams with a 4mm pin flat against the head surface? crank at OT? intake sprocket turned CW?
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Old 04-15-2019, 11:07 AM
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How did you time? did you verify the positions of the cams with a 4mm pin flat against the head surface? crank at OT? intake sprocket turned CW?
Yup did everything. Iím 100 percent the timing is spot on. I checked.. rotated the engine double checked.. rotated a few times checked again. Variable Intake cam sprocket turned clockwise. I ran a shope inside and thereís no physical damage. Piston top is untouched.
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Old 04-15-2019, 12:09 PM
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Post the compression data of all 6 cyl with spark plugs removed. Obviously there is a mechanical fault (since 0 compression at cyl #6) I would get that sorted first.
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Old 04-15-2019, 01:09 PM
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Ok Iíll do that after work.

The only thing I can think of is that I put a lil bit of oil on the cylinder walls .. maybe it pooled on the piston and hydro locked or I had an issue with the exhaust cam being out of timing when I installed the head. I didnít force anything. Maybe that was enough to bend a valve a little.
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Old 04-20-2019, 09:31 PM
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Head is off. Number 6 valves are bent a lil. Not fully seating.
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Old 04-20-2019, 09:52 PM
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what about cylinders 4,5 ?better check all of them, did you get a head gasket yet ? I may have 1 ill donate to your cause, im an mb tech was given about 4 104 gaskets from another engine guy that moved, im in L.A, just come pick it up im off Monday, I even have used valves if you need them
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Old 04-20-2019, 10:13 PM
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Originally Posted by nulu View Post
what about cylinders 4,5 ?better check all of them, did you get a head gasket yet ? I may have 1 ill donate to your cause, im an mb tech was given about 4 104 gaskets from another engine guy that moved, im in L.A, just come pick it up im off Monday, I even have used valves if you need them
Number 4 and 5 appear to be ok. Iíll have the shop check everything. I was going to do a big pelican parts order next Friday. I probably could use those valves tho. The machine shop will definitely charge me a good penny for theirs. What part of la? Itíll be about a 2+ hour drive for me

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