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A Bag of Spanners......

 
 
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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 Jul 26, 2007 7:52 pm    Post subject: A Bag of Spanners...... Reply with quote

Got the engine running, vaguely. But as the title suggests its making noises resembling a bag of spanners.

It sounds very tidy at idle, and it revs to about 3rd of the revs, then any more and it starts backfiring and flames through the carb. Then it cuts out.

I've replaced the old dizzy cap, replaced and set points, cleaned and checked the plugs, cleaned rotor arm.

I've set the carb up as it states in manual.

Cant seem to get strobe lamp working on the leads to time it perfect.



And thats from 4 days solid out in the damp.



HELP Evil or Very Mad

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Off road accessories at down to earth prices, bumpers, suspension, protection and more at www.dtfabrications.co.uk
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minimog
Off-Road Guru


Joined: 25 Nov 2004
Odometer: 1700




PostPosted: Thu Jul 26, 2007 8:47 pm    Post subject: Reply with quote

sounds like your timing is out or your plug leads are incorrectly fitted
__________________________________
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: Fri Jul 27, 2007 7:58 pm    Post subject: Reply with quote

Check the tappets.
__________________________________
Nat

If You Open Your Mind Too Much Your Brain Will Fall Out
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shaggy
Articulating


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


1961 Mercedes-Benz Unimog 404 Doka

PostPosted: Fri Jul 27, 2007 8:19 pm    Post subject: Reply with quote

Dude, we can lend you a civilianised original dizzy if you want. Also, clean the hell out of the carb, jets and stuff.

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: Sun Jul 29, 2007 8:28 am    Post subject: Reply with quote

Quote:
Check the tappets


Thats a good idea, didnt think about that, right, off to get feeler gauges.

I dont think theres a problem with the dizzy, though thanks for the offer.

Where are the weights in the dizzy? The dizzy I have has been left out in the elements for the past 10 years since being out of service, so could well be them.

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DDBCretin
Gate Opener


Joined: 29 Jul 2007
Odometer: 5




PostPosted: Sun Jul 29, 2007 4:20 pm    Post subject: Reply with quote

Cleaning and rebuilding the distributor is a good idea, even if it's not causing your current problem. It's not hard to do and it's a good pmcs item.

Check out this site for step by step instructions for Bosch distributor rebuilding. They don't have the one used in the 404, but they all seem pretty much alike.

http://www.glenn-ring.com/010/

Happy mogging. Smile
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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: Mon Jul 30, 2007 11:36 am    Post subject: Reply with quote

Well found out that...

The tappets were incorrectly set...now sorted

And its only firing on 4 all the time, intermitent on 2 cylinder and 5 not sparking at all.

Took leads off and they are sending a spark, so....

New plugs me thinks.

thats another 60 odd quid to add to the bill.

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