I am reviving an old project and want to find out as much as I can about this engine a scrap yard find. I wish to run this smoking engine without the exhaust manifold on to observe each cylinder. I have the exhaust manifold off and turbo so can I

1) block the turbo oil supply line

2) just feed the supply back to the sump directly

3) choke some oil supply and returnto sump.

I have a spareoil supply I could modify.

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92 e300d2.5t
01 e320
05 cdi
85 chev c10

In theory the oil pump should have more than enough flow to care for the turbo feed just returning to the sump but I'd double check the oil pressure once it had started just in case. You could also just chuck an ordinary bolt in place of the banjo bolt on the oil filter housing (assuming 603s have them) as well

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1978 300D, 373,000km 617.912, 711.113 5 speed, 7.5mm superpump, HX30W turbo...many, many years in the making....
1977 280> 300D - 500,000km+ (to be sold...)
1984 240TD>300TD 121,000 miles, *gone*
1977 250 parts car
1988 Toyota Corona 2.0D *gone*
1975 FJ45>HJ45
1981 200>240D (to be sold...)
1999 Hyundai Lantra 1.6 *gone*
1980s Lansing Bagnall FOER 5.2 Forklift (the Mk2 engine hoist)
2001 Holden Rodeo 4JB1T 2WD

The turbo is not "pressurized" with oil when the engine runs, the oil basically just passes straight through to the pan. There's no reason you can't just have the oil flow straight to the pan to test what you want. 603's have the oil feed threaded into the block, not tapped off the filter housing with a banjo.

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Ok I'll just pipe it back to the sump.

On another topic why would exhaust valve number 1 be oil soaked and all others dry.

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92 e300d2.5t
01 e320
05 cdi
85 chev c10

Bad valve seal maybe? That would be my first guess.

New valve seal and guide. Maybe need to do another leak down test on number 1.

__________________
92 e300d2.5t
01 e320
05 cdi
85 chev c10