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1986 Unimog U1700L (435 series)
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Discussion Starter #1
Hello, I have looked for the engine number but no avail. I should have done it when the cab was up, but its loo late. Its not visible from inside the cab via the doghouse cover, nor on the sides?
 

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1986 Unimog U1700L (435 series)
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339 Posts
Discussion Starter #2
Well I'm red faced now. It is not on the engine, but was staring me in the face on the rocker cover where I was told it should be.Thanks everyone for input. Good that I checked it. Rego papers have it correct (thats what matters) but sales receipt description has a typo on it.
 

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U1000Ag
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As far as I know it also appears on the block - but not easy to see ! When I went for my roadworthy, the inspector was not happy about it being on the rocker cover and wanted to confirm the block number. I seem to recall it was somewhere near the engine air compressor - but my memory is not what it used to be !!
 

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Hello all, and Jason F2, I hope you don’t mind me hijacking your thread!

Now that we know our engine numbers where can we find details or specifications on them?
Mine is 366188xxxxxxx, does that make it a OM366?
 

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1986 Unimog U1700L (435 series)
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Discussion Starter #6
Hi HogRider666, Interesting thought. Mine is 353 959 20 835*** I have seen various documents referring to it as a 353 engine. Its specifically an OM352a. Maybe the 353 means a step up from the plain OM352 ? I don't know how it works.

If I had to guess, and its total guess, based on my engine number, maybe yours is a 366?
 

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The first triplet is the engine series. The second triplet of the engine number can be thought of as the version or equipment designator of the engine. So a 366188xxxxxxx is an OM366.188 model. A 353959xxxxxxx is an OM353.959, an OM352A (both 352. and 353. are OM352 engines). The version designator indicates a specific HP tuning level, internal components, and accessory package. The next 2 numbers (or possibly sometimes 3 numbers?) indicated left/righthand drive configuration and transmission, and the final 6 numbers are the engine serial number.

I have yet to find a complete inclusive list, but many of the engine manuals have subsets of specific engine codes. So, for instance, from one manual:
  • 352.913 is an OM352A1 tuned for 110kW with a 420W/14V alternator and engine brake
  • 352.937 is an OM352A2 tuned for 115kW with a 660W/14V alternator, engine brake, air compressor, and power steering pump
  • 353.978 is an OM352A5 tunes for 124kW... etc.
I don't have a listing in my notes for a 366.188 (the OM366 is a relatively short-lived successor to the OM352 series). Are you sure that is the stamped engine serial number and not a part number? Or perhaps the number is actually 366.988?

A 353.959 is a turbo OM352A (I believe specifically an OM352A5) with a 16:1 compression ratio and tuned for 124kW.
 
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