#1
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Rebuilt Engine 1st startup: intake port soot?
I started up my D24t/240 project motor and it ran wonderfully. The engine is a rebuild, and this was its first startup. Afterwards, I took the intake manifold off, and noticed that one of the intake ports had more soot lining it than the rest, which were relatively clean. Not like solid black, just a good dusting of soot. I also noticed in each port, a thin, black drip of something burnt. Any ideas why this might happen? If so, is it typical for this to happen during a break in period, or do I have a problem? I'm probably being really paranoid, but just wondered what people thought.
Any ideas or explanations from you guys would be appreciated. Thanks, Abe |
#2
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Sounds like a tight valve or the cam is slightly out of time. Where is the black stuff comming from.?
Jason
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Back again with a '84 760 GLE D24T/ZF SOLD but not forgotten! 1984 760 Sedan, built D24Tic/ T-5 swapped My engine build: http://www.d24t.com/showthread.php?t...t=engine+build T-5 swap: http://d24t.com/showthread.php?399-W...to-quot-w-pics! |
#3
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intake soot
Quote:
I will wipe them all out before I replace the intake and check it again when I adjust the valves. Its only been through two thermal cycles and hasn't been driven yet, just revived it up and down both times to make sure the thing was good. I will be driving it this weekend. I have to torque the head bolts afterwards so I will check everything out then. Thanks Jason. Abe |
#4
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Quote:
it's all of them first then, one of them more than the others. soot is exhaust gaz exiting by the non closed intake valves during compression strokes maybe. seats have been machined i guess. the guy did valves adjustment ? is it difficult to start the engine ? why to torque the heads bolts ? it's supposed to be done if you ran the engine. the mls gasket do not need re torquing as i know. are you sure your intake gasket is not leaky and let your head to suck soot ?
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#5
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Quote:
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#6
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the head gasket :
if volvo or equivalent oem it's there http://www.scribd.com/michaelovitch/...sket-mls-volvo you don't need a torque wrench for the intake manifold.it's overkill here. tighten from the center ang one left one right then check from one side to an other. if it's loose it will suck of course but you should check your valve first like it was said. but it seems strange that all your valves are out. are you sure it's not a residue of some assembly or cleaning product of stuff like that let by the builder ?
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#7
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Only one port has soot. The rest are pretty clean. I will be checking and adjusting them this weekend. Thanks for the link.
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