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Old 07-22-2020, 08:28 PM
v8volvo v8volvo is offline
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Join Date: Jun 2009
Location: Montana, USA
Vehicle: '86 745, '83 764
Posts: 1,618
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Welcome, sharp looking wagon! And a 6.2TD in a van with a modern transmission sounds like an interesting setup too.

Crank but no start with smoke is usually either glow plug issue or timing issue. Does it try to fire at all or just spin on the starter and do nothing?

You say you have 12V to the glow plug bus but do you know if the plugs themselves are good? You can check with ohmmeter or test light, or an inductive ammeter on the glow plug power supply wire. Should be roughly 12 amps per plug if you use that method so you want to see ~70A plus or minus. If it's less then you know you are down a few plugs and can do the calculation to figure out how many are working. These engines really like to have all 6 plugs working, will usually start OK but smoky with 5, will usually start on 4 but with struggle. If only 3 or fewer working plugs, often no start at all or if they do it requires great effort, depends on condition of engine and on altitude and temperature.

Timing marks line up means timing is "close" but it may still not be close enough to run, these are timed with a dial indicator procedure that is easy once you have done it but requires the right tools and attentive execution, getting it close with marks is often not enough. And it can be 180 degrees out with the marks still visually lined up! We have all done that one time or another.

Do you know the history of the car and when/how it last ran? Was it a good running car that got parked while still running well, and then you got it and are reviving it? Or did it run for you at some point before, then quit? Or, did it never start again after somebody attempted a timing belt replacement????

Valve clearance out of spec is a (long shot, theoretical) possibility for affecting starting but probably not as likely as the more common causes above. If it sounds good when cranking, i.e. even rhythm, then that probably means valve clearance is not an issue or at least not enough to matter for getting started. I wouldn't worry about that for now IMO.
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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