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  #1  
Old 01-18-2004, 03:17 PM
240dnewbie
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How much stretch?

Any opinions on my timing? First set of pics is a hair before the mark, I think, and the second set is on (maybe).

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Old 01-18-2004, 03:18 PM
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Old 01-18-2004, 03:19 PM
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Old 01-18-2004, 03:20 PM
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Old 01-18-2004, 03:22 PM
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Looks like you got about 2-1/2 to 3 degrees of stretch. I'd run it for awhile longer.
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Old 01-18-2004, 05:41 PM
240dnewbie
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Thanks for the reply, one more thing checked of on the way to (hopefully) reduce the smoke, esp. at idle.
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  #7  
Old 01-18-2004, 06:34 PM
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Have you replaced your valve seals ?
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Old 01-18-2004, 08:47 PM
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No, been reading up on it first. Are you talking about the seals that are on the stem of the valve? Would that be letting oil through into the valve cover and into the vent?
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Old 01-18-2004, 08:52 PM
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Other way 240d. It would be letting oil from the cam area into the cylinders where it would be getting burned and making smoke. How bad is your oil consumption?

Please explain how you took that first picture of the crankshaft timing indicator. I have a heckuva time taking a close up digital pic like that that is in focus.
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Old 01-18-2004, 09:08 PM
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Oh I get it. On the photos try turning off the auto focus. It will get fooled by the foreground and try to focus on it. Not too bad on the oil, a quart every 300 to 500 depending on how much time I spend at 85 or 90:p
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  #11  
Old 01-19-2004, 12:50 AM
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Great pics that resolve chain-stretch measurement technique off the crankshaft pulley once and for all.

Whats the mileage on the car and whats the nature of the smoke?? If its blue and stinks of unburnt diesel fuel then the problem could also be IP timing...... otherwise, try measuring oil consumption at speeds that never exceed 75- 80mph and it will drop off dramatically say, to healthier 1 qt per 1000 miles.

Aside from start up, another way to look for smoke is at night in sideview mirror when accelerating and going through the gears from standing start at traffic light.... the smoke will be illuminated by lights of the car behind you, same as cigarette smoke lighted up by desklamp in an otherwise darkened room.

Last edited by 300SDog; 01-19-2004 at 06:53 PM.
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Old 01-19-2004, 08:34 AM
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Well, it's either 106000, 206000, or 306,000. No info from the P.O. The smoke is light grey, and doesn't smell too much like a popcorn stand on fire (running B-100). On the speed issue, I drive the Ventura / Santa Barbara corridor, where it's common to have one lane down to 60 and the other doing 95, so it's tough keeping a steady 70-75
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  #13  
Old 01-19-2004, 08:46 AM
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"Great pics that resolve chain-stretch measurement technique off the flywheel once and for all." ----240DieselDog

This is on the other end from the flywheel.... and it does not resolve it because the Factory Shop manual specifically says to use the dial indicator on the number one intake valve opening method of checking chain stretch anytime there is a performance complaint... a method designed to zero out some other wear factors which can be extant on an old engine... and check it against what the engineers who designed the engine were shooting for with regard to actual engine/chain performance....
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  #14  
Old 01-19-2004, 07:45 PM
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gimme a low-tech 240D
 
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Popcorn smell sounds like oil to me....... After valve seals go, valve guides and valve seats will soon follow - especially since the slow lane is out of the question. Figure the 240D engine might have lasted for another 100k miles if seals were immediately replaced when oil seapage/burning was first noticed and the car was not being abused. Sorry dnewbie, but am thinkin 1976 oil burning 240 engine driven at 90mph will not last long.

Leatherman, granted i meant crankshaft pulley instead of flywheel... What exactly is wrong with measuring chain stretch as illustrated above?
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  #15  
Old 01-19-2004, 08:17 PM
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If there is any performance complaint causing the chain stretch to be checked...... then the Factory Shop manual SPECIFIES that the other method be used....

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