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Timing Starting Woes M180 engine

 
 
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The Original Donk
Off-Road Guru


Joined: 28 Nov 2004
Odometer: 1638
Location: The Wilds of Wales


1963 Mercedes-Benz Unimog 404 Doka

PostPosted: Tue Jun 05, 2007 9:50 pm    Post subject: Timing Starting Woes M180 engine Reply with quote

Well the wiring loom is in and I've got a spark. The fuel is coming through fine, but will not start, and is firing, but not running when pour petrol down the carb. Someone has told me that the ignition timing needs to be 20 degrees before TDC, is this right?


Any suggestions either saying if this is correct or any other suggestions as to why its not starting gratefully accepted.
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shaggy
Articulating


Joined: 08 Feb 2007
Odometer: 560
Location: Manchester, UK


1961 Mercedes-Benz Unimog 404 Doka

PostPosted: Tue Jun 05, 2007 10:27 pm    Post subject: Reply with quote

They'll run on a huge variance in timing, but obviously there's a good bit. I'm sure ours is only 5 degrees BTDC - set statically. We actually run with a vacuum advance dizzy rather than the normal.

All the undiagnosed problems we've had have been with the carb rather than the dizzy. To start from cold I pump the throttle in a way that would utterly flood anything else, but it starts.

Frankly, I'd lob a bit of easy start in it and see what happens.

jim
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The Original Donk
Off-Road Guru


Joined: 28 Nov 2004
Odometer: 1638
Location: The Wilds of Wales


1963 Mercedes-Benz Unimog 404 Doka

PostPosted: Wed Jun 06, 2007 7:05 am    Post subject: Reply with quote

that was one thing I didnt want to use was easy start, as tractors that I've had previously became addicted to sniff.
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minimog
Off-Road Guru


Joined: 25 Nov 2004
Odometer: 1700




PostPosted: Wed Jun 06, 2007 7:03 pm    Post subject: Reply with quote

has the dizzy been off if so are you sure its not 180degrees out
that would cause it to fire on the exaust stroke rather than on the compresion stroke

__________________________________
WHAT YOUR ASKED WHEN YOU OWN A MOG
"why have you put a merc star on that"
UNIMOG MOTTO
"IF IT CARNT BE FIXED WITH A BIG HAMMER"
IT MUST BE AN ELECTRICAL FAULT"
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Nathaniel
Difflock Royalty


Joined: 13 May 2003
Odometer: 17901
Location: North, North Yorkshire


1979 Suzuki LJ

PostPosted: Wed Jun 06, 2007 10:02 pm    Post subject: Reply with quote

I think Triss is closer to the mark, try turning the Dizzy 180*

Plenty of compression yeah?

Easy start doesn't help, a petrol shouldn't need it, its much harder to damage a petrol with it but easier to blow your hand off.

exhaust is not blocked is it?

__________________________________
Nat

If You Open Your Mind Too Much Your Brain Will Fall Out
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The Original Donk
Off-Road Guru


Joined: 28 Nov 2004
Odometer: 1638
Location: The Wilds of Wales


1963 Mercedes-Benz Unimog 404 Doka

PostPosted: Thu Jun 07, 2007 5:45 pm    Post subject: Reply with quote

well, i've nearly cracked it, wont start unless pour some juice down the darb, then it fires up for a second until its all used and then nothing, I'm now thinking its a fuelling problem. Ignition timing is spot on. i've got three carbs and two fuel pumps to play with so should be able to sort it fingers crossed.
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minimog
Off-Road Guru


Joined: 25 Nov 2004
Odometer: 1700




PostPosted: Thu Jun 07, 2007 8:46 pm    Post subject: Reply with quote

right so it does fire then it could be the float neddle stuck into its seat and not letting fuel into the carb
__________________________________
WHAT YOUR ASKED WHEN YOU OWN A MOG
"why have you put a merc star on that"
UNIMOG MOTTO
"IF IT CARNT BE FIXED WITH A BIG HAMMER"
IT MUST BE AN ELECTRICAL FAULT"
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shaggy
Articulating


Joined: 08 Feb 2007
Odometer: 560
Location: Manchester, UK


1961 Mercedes-Benz Unimog 404 Doka

PostPosted: Sun Jun 10, 2007 3:54 pm    Post subject: Reply with quote

carb needs cleaning every year, I stay well away from it, but I believe it's quite easy.
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moggs
Just got MTs


Joined: 23 Nov 2005
Odometer: 227
Location: kendal cumbria


2007 Mercedes-Benz s404.1

PostPosted: Sat Jun 23, 2007 6:24 pm    Post subject: Reply with quote

starting, mine is a pig for starting on petrol, half choke no revs and push the pushey button, eventualy she goes, pulls crap when cold though,
just stick it on gas, starts and runs perfect little bit choke and away yu go.
make sure the plug set up is right and use champion plugs, ngk are shyte, bosche seem ok too.
the timing on running is approx 15 degrees btdc, the marks on the flywheel are in increments of ten though they are not 1 2 3 4 5 6
they are 10 20 30 40 50
good luck
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