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Old 07-24-2012, 12:46 AM
sixto's Avatar
smoke gets in your eyes
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I did a backyard blow-by test when the head was off the SDL - I put equal amounts of oil in each open cylinder and measured the oil level over time. It took days to notice any drop in oil level. That said, it might take a long time for oil to drip through the prechamber with no way to confirm that the combustion chamber is full :/

87 300D^2
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Old 07-24-2012, 10:46 AM
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I think this is one case where if you want your Pointer lined up right the Dial Indicator is the way to go.
The only way to be sure other methods work is to do the other method and then check it with the Dial Indicator.
84 300D, 82 Volvo 244Gl Diesel
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Old 07-24-2012, 11:21 AM
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The FSM method involves screwing an adapter into the prechamber hole (PC removed) and then mounting a DG on top of it - measuring the stroke to a certain amount and then rotating further to line up at 20 ATDC on the damper scale, and the little pip on the damper should line up exactly central in the hole of the scale which is provided to mount the TDC sensor tool.
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Old 08-04-2012, 07:33 PM
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Hey guys I know I'm deviating from the way this thread has headed but I have a question related to cam chain stretch. I have right around 2.5 degrees defference between the camshaft & the crankshaft. I was pondering going with a woodruff key to restore to OEM spec, but I am uncertain weather the worn chain is going to wear the sprockets significantly faster as happens on a motorcycle. Any danger of it breaking with wear?

Mike w.
1984 300sd auto with 246,000 miles
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Old 03-24-2016, 03:43 AM
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Originally Posted by 300D-91 View Post
sixto your photo was priceless, thank you!

Turns out I was lining up my cam with a nick (orange arrow) in the cap and not the correct mark (red arrow)

After properly aligning things my stretch looks good

FYI: The engine has 282,392 miles and the chain was last changed at 123,200.

does anyone else not notice that is BTDC and not ATDC........
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Old 03-25-2016, 06:11 AM
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chain stretch can only show up ATDC, and not before. This is because the chain tensioner and tension rail are only on the passenger side of the engine, and it rotates in the direction towards the driver's side. The chain probably had close to no stretch before being replaced and the indicator bracket was off. It seems to be more common for the indicator bracket to be off than was previously thought (myself included).
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