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mog running rough

 
 
Post new topic   Reply to topic    Difflock Forum Index -> Mercedes & Unimog
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gary27
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Joined: 07 Aug 2011
Odometer: 34
Location: Italy



PostPosted: Mon Feb 27, 2012 2:29 pm    Post subject: mog running rough Reply with quote

Hi guys
Got a problem with the mog and if somone can that'll be great
It's takes a lot to get it started especially if it is cold it looks like the spring is broken on the manifold.
when i do get it running it seems to idle fast and if i give a rev and then come of the gas the revs drop and it stalls but then starts up again with no trouble? could it be the butterfly is stuck.
There is a strong smell of petrol mainly from the exhurst and it back fires when revved hard and also there is a poping comming ether from the manifold or the carb not sure which
.I've tride to adjust the carb but it dosn't make a diferance ifnfact it dose nothing atall?.
could it be the fuel lift pump over fueling or somthing else any advice would be well apreciated.
Thanks for you time
Gary
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dxmedia
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Joined: 10 Dec 2008
Odometer: 2185




PostPosted: Mon Feb 27, 2012 3:49 pm    Post subject: Reply with quote

There's nothing on the carb to adjust for normal running!.

The two screws at the front are for the idle mixture.

Is it running on 6 cylinders? If not then I'd look at the plugs for starters. Mog's do NOT like idling. You can coke up a 404 in several minutes if you just start it and leave it. You'll then drop down on to 5 or 4 cylinders and then you've the unburnt fuel issues (sump filling with petrol).

Have you touched the idle speed screw? Sounds like it's running on not 6 cylinders with the idle speed set too high. You've also got a problem with the cold running flap.

I would suggest the following.

1/ Undo the 4 bolts which hold the carb on and take it off, unclip the throttle linkage. With a torch have a look down the manifold at that flap thing (the pre heater for cold running). Wire it into the closed position.

2/ Put the carb back on. Gently wind in the 2 idle mixture screws till there's a little bit of pressure (don't wind in too hard since you'll damage the end of the needle) and turn out 2 1/2 turns on each one - This is approximately the correct position.

3/Take out the spark plugs and clean them well. In fact, if you can be bothered and your using civilian leads buy some new BP6ES plugs.

4/ Set the points to 0.5 and the plugs to 0.4 (think it's that way around).

5/ Grease the throttle linkage.

Put it all back together and see how it is.
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gary27
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PostPosted: Mon Feb 27, 2012 5:33 pm    Post subject: Reply with quote

Thanks for the reply I'll gfet out there tonight and do what you said and see if it makes a differance
Cheers
Gary
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gary27
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PostPosted: Mon Feb 27, 2012 8:10 pm    Post subject: Reply with quote

O.k your spot on number 3 pot is not firing balck wet plug,all the others are really good so cleaned it up and will put it back together tomorow and see what happens.
If it's not just a fouled plug what you thoughts on what could be the problem?
Cheers
Gary
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johnhughes
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Joined: 01 Dec 2009
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PostPosted: Mon Feb 27, 2012 8:24 pm    Post subject: Reply with quote

Check you plug leads and distributer cap are ok. plus it is very important for a 404 exhaust system to be air tight, they frequently leak around the joints and especially at the manifold by the Y pipe.
Don't worry 404 engines are easy to sort.

Very Happy

j
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gary27
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PostPosted: Wed Feb 29, 2012 1:02 pm    Post subject: Reply with quote

well got it running sweet yesterday and now it's missfiring again, The plugs keep fouling so i'm going to have to do some more adjusting but i can't understand how it could run so sweet and then not?
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dxmedia
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Joined: 10 Dec 2008
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PostPosted: Wed Feb 29, 2012 1:21 pm    Post subject: Reply with quote

Do you have any air leaks around the manifolds?

Plug gap, bad lead, if it's one cylinder it's either a leak or a spark issue.
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v8alligator
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Joined: 02 Jan 2011
Odometer: 19
Location: Haslemere Surrey



PostPosted: Wed Feb 29, 2012 6:17 pm    Post subject: Reply with quote

Hi,

I had the same problem with my 404. It turned out to be a sunk float which was causing the carb to overfual.

Regards,

__________________________________
Atkinson Alligator Universal Carrier
Unimog 404
Land rover S11 3.9V8
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gary27
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PostPosted: Thu Mar 01, 2012 4:45 pm    Post subject: Reply with quote

Cheacked all the plugs leads and dizzy All o.k striped the carb for some reason and rebuilt it got it all back together and it's still bad it did the biggest bang i've ever hard from a truck the kids thought it wa great but it has got me really worried.took the plugs back out and one of them the third one in from the front is wet but not choked up and when i pulledd the plug out smoke came out of the plug hole also there was a little bit of oil on the plug,so again I cheaked for a spark it has one.I now fear the worst head gasket or worse.can anyone help as I'm stumped.
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dxmedia
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PostPosted: Thu Mar 01, 2012 7:43 pm    Post subject: Reply with quote

Leaking inlet / exhaust gasket?
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gary27
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PostPosted: Sun Mar 04, 2012 7:03 pm    Post subject: Reply with quote

So just spent the better prt of two days stripping and rebuilding the mog.I changed the inlet/exhurst Gasket striped and rebuilt the carb again as there was a vacum leak so made all new gaskets,nd went through the ignition system again and the result:- carb is no longer leaking, the inlet gasket which it turned out was leaking but now has a new gasket (luckily I had one) and is now longer leaking.So the engine is ticking over nice and smooth but still has a little pop from the exhurst every now and then.The problem now comes when I rev the engine.when I press the exclerator the revs drop and somtimes the engine stalls? when I drive it it has a real lack of power and still one of the plugs is wet with fuel so any thoughts?.I'm not sure if the ignition system i.e the dizzy cap isn't to blame?.
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dxmedia
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PostPosted: Mon Mar 05, 2012 8:34 am    Post subject: Reply with quote

What was the condition of the accelerator pump?
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gary27
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PostPosted: Mon Mar 05, 2012 12:06 pm    Post subject: Reply with quote

well looks like i'll be stripping the carb again i'm starting to really love my mog as I seem to spend more time with it han i do my wife lol
I'll let you know what i find but all the peaces where new but it could be the gasket Imade vfouling somthing up,that said i'm still convinced that somthings not right with that wet spark plug?.
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gary27
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PostPosted: Mon Mar 05, 2012 12:40 pm    Post subject: Reply with quote

just stipe do the carb and the only thing i could see was the gasket wasn't quite right so i have adjusted and will see what happens when i finish work tonight
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dxmedia
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PostPosted: Mon Mar 05, 2012 1:18 pm    Post subject: Reply with quote

It's about £70 for a full rebuild kit.

Get a light and a mirror, take off the air inlet and push down the accelerator pump. If you can see a dribble of fuel coming out then this is bad. If you can see a fine mist then this is good.

If one of the pump jets is a little blocked a dribble will soot up the plugs on one bank pretty quick.

Did you clean with carb cleaner when you had it all apart?
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gary27
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Location: Italy



PostPosted: Mon Mar 12, 2012 6:14 am    Post subject: Reply with quote

I made some headway yesterday turns out there was a list of problems including gaskets leaking 1 spark plug had failed I.E got a spark from it but it was not a stronger enough spark which is strange as they are only around three months old and the right plugs for the mog?.Some of the leads were in not such a good condision the rotor arm was bent ( I've never seen that before?)So I'm thinking the dizzy cap needs changing to.
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