After changing and fixing
-injectors
-glow plugs
-valve adjustment

I am having trouble getting the car to turn over.

I have checked the compression and it is looking okay.

The fuel lines are getting fuel through them and getting into the injectors.

Is there anything you guys recommend I should check out?
Thanks

Hi everyone,

When I try to start the engine with the key, the engine is not cranking AND it keeps on burning out fuse C.

The car is a 78' 300D.

Any suggestions?

What was the reason for the repairs? Was it just general maintenance or because engine was difficult to start/run?

Define difficult to turn over? Are you referring to low battery charge unable to crank over engine?

Did you use new heat shields? Proper torque on the injectors? Did you inspect the prechambers while the injectors were out?
Crack the injection lines and have a partner turn the motor over while you watch for diesel coming from the tubes. If you have diesel at all lines, I would double check the valve clearances and make sure that you didn't mix up intake and exhaust.
Good luck.

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also, fully functional glow plugs are essential on the older motors to start. "turn over" has many definitions, and is best left out of a conversation trying to fix a car...

which type of glow plugs are in your motor? have you tested them to verify voltage is getting to them all? have you checked resistance, or amp draw?

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Burning out fuse 'C'.....

Has a wire been trapped and partially cut through somewhere during the work and shorting to deck?-- Say, jammed between a screw/bolt fixing or other item and crushed shorting it out?

Think thats where I would look first. An engine thats had new injectors or had the hard-lines off will take some fair amount of spinning over to prime up the empty injectors and lines....

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W123, 1985 300TD Wagon, 256K,
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W114, 1975 280E Custard Yellow,
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'i have trouble getting the the engine to turn', if that's actually what's going on, usually means something along the line

~ the motor struggles to even turn over, turns over slow, in a very weak way etc

the better you are able to describe accurately what exactly is going on, the faster and easier it is to diagnose a problem

was this 'engine slow to turnover' problem evident prior to the above work?

slow turn over is often related to starter, Bat and or wiring issues

is the engine attempting to fire up, or start? catching a bit?

is the motor in fact turning over well but just not starting, or even trying to fire up? these can certainly be problematic with a slow, weak turnover scenario, or even if the turnover is fine

i'm understanding your post as a start/turnover issue problem that manifested mainly after the above work?

Assuming the engine cranking speed is OK.

My best guess:

*** Air in the injectors and lines = this requires cranking the engine until the injection pump forces all the air out = you may need to recharge the battery several times.
Never crank longer than 60 seconds, and rest - cool down 15 minutes before cranking again.

* Incorrect valve adjustment.

* Broken/damaged glow plugs, this is commonly caused by over tightening the glow plug nut.


.

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He has/had the older style loop glow plugs....

If you upgraded to the pencil plugs, you most likely connected the ground wire on the block to the last glow plug....big no no....plus you can't use the resistant wires from the older loop style to wire up the pencil.

Or if you installed the loop plugs....you didn't wire the insulators up right...

Its a glow plug problem!

Review this

http://dieselgiant.com/mercedesdieselloopglowplugrepair.htm

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I would second what Cool says on this one. If by fuse you mean that big one on the back firewall.....

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Yeh I am to lazy to open my hood and check, but I think the fuse he mentions is for the aux fan and heating..

Shorting 12v to the block will cause all sorts of issues. His battery is also probably cooked...who knows what else....not sure that the gp fuse would have blown...

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Insufficient data either way.
The way I read it he replaced them, but it might be construed as upgraded.
The original poster needs to clear this up.

.

agreed, we need more info and or photos...just going by the multiple post I've read were newbies have issues figuring out the old school plugs and/or upgrade.

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any more info?