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Old 05-15-2017, 03:18 AM   #1
correllbil
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Default Engine Swap Info

Can a OM647 engine block be installed into a 2002 Freightliner sprinter using the OM612 external items like turbo, intake, etc.? What would have to be done to install a complete OM647 engine into my 2002 sprinter?

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Old 05-15-2017, 03:31 AM   #2
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Default Re: Engine Swap Info

A complete OM647 engine cannot easily be swapped into a Sprinter that came OEM with a OM612 engine.

Some information is here.
https://sprinter-source.com/forum/sh...207#post492207

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Old 05-15-2017, 05:14 AM   #3
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Default Re: Engine Swap Info

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Originally Posted by correllbil View Post
Can a OM647 engine block be installed into a 2002 Freightliner sprinter using the OM612 external items like turbo, intake, etc.?
It appears you are asking whether a 647 long block (cylinder head included) can be used.

The complication you have is mounting and driving the mechanical feed pump and the 612 high pump.

The 647 intake cam lacks the drive extension for the 612 feed pump and the 647 upper chain ramp plate lacks the opening and threaded mounting holes for the feed pump.

The 647 cylinder heads' bolt pattern for the high pump will not allow mounting of your 612 high pump.

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Old 05-18-2017, 12:01 PM   #4
correllbil
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Default Re: Engine Swap Info

Could I use the short block route to use the 05 647 Engine?
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Old 05-19-2017, 05:09 AM   #5
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Default Re: Engine Swap Info

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Originally Posted by correllbil View Post
Could I use the short block route to use the 05 647 Engine?
The 647 piston's combustion bowls differ in configuration from the 612 and the 647's smaller valve diameters may mean there are slightly smaller valve relief pockets on the 647's piston crowns (I don't recall and I have yet to unpack all my pistons to compare for you) but otherwise there should be no issue.

Be sure to use the 647 flexplate (flywheel).

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Old 05-23-2017, 05:41 AM   #6
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Default Re: Engine Swap Info

Quote:
Originally Posted by correllbil View Post
Could I use the short block route to use the 05 647 Engine?
A follow up: As your luck would have it, I needed to find my stash of 612 pistons for an engine repair.

My hunch was correct, the 612 piston crowns' valve reliefs are sized for the larger diameter tulip heads of the 612 valves and the 647 valve reliefs are accordingly smaller.

Thus it appears risky to bolt a 612 head onto a 647 short block.

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