971of1000
Well-known member
i am having an issue with some blue smoke at startup and as soon as i start off at a stoplight. recently rebuilt the turbo. motor showed 140psi compression last time i tested it. any thoughts?
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a little blue smoke
- Thread starter971of1000
- Start date
Blue smoke is gernally from burnt oil i belive. How long has it been happening? Possibly oil in the DP from the old turbo? Valve guide seals? Has the head been worked on lately? How many miles?
turbowop
Well-known member
Valve seals. Guaranteed.
971of1000
Well-known member
probably ought to save my bucks and get some valve springs and head studs and head gasket at least while im at it.
Valve seals rarely go unless valve guides are bad. Valve guides usually cost (much) less than seals.
I don't know about the 4g63, but on crappy Honda 1.5's they cost $1.00. Press them out, press them in, or have a machine shop do it. Should not be expensive. Or DIY for the win!
If your guides are bad and you do all that other work, those brand new seals will be hogged out within 5000 miles and you will have smoke again......
I don't know about the 4g63, but on crappy Honda 1.5's they cost $1.00. Press them out, press them in, or have a machine shop do it. Should not be expensive. Or DIY for the win!
If your guides are bad and you do all that other work, those brand new seals will be hogged out within 5000 miles and you will have smoke again......
Last edited by a moderator:
cbr900turbo
Well-known member
If your unsure measure the clearence between the guide and valve stem. no guessing there
turbowop
Well-known member
Quoting 687OF2000:
Valve seals rarely go unless valve guides are bad. Valve guides usually cost (much) less than seals.
I don't know about the 4g63, but on crappy Honda 1.5's they cost $1.00. Press them out, press them in, or have a machine shop do it. Should not be expensive. Or DIY for the win!
If your guides are bad and you do all that other work, those brand new seals will be hogged out within 5000 miles and you will have smoke again......
This isn't necessarily true on the 4g63. And putting guides in ain't gonna happen with the head on the car like you can do with just a stem seal installation. I put seals only in 1051 about a decade ago and they held up for well over 5k miles afterwards. I would try seals first, then if it smokes later on due to guides, pull the head and have it rebuilt with new guides/seals/valves/etc.
Valve seals rarely go unless valve guides are bad. Valve guides usually cost (much) less than seals.
I don't know about the 4g63, but on crappy Honda 1.5's they cost $1.00. Press them out, press them in, or have a machine shop do it. Should not be expensive. Or DIY for the win!
If your guides are bad and you do all that other work, those brand new seals will be hogged out within 5000 miles and you will have smoke again......
This isn't necessarily true on the 4g63. And putting guides in ain't gonna happen with the head on the car like you can do with just a stem seal installation. I put seals only in 1051 about a decade ago and they held up for well over 5k miles afterwards. I would try seals first, then if it smokes later on due to guides, pull the head and have it rebuilt with new guides/seals/valves/etc.
Well, he was already talking about a headgasket.... Good to know that isn't necessarily true, that's just what my 32k tech school taught me.....Of course they contradict themselves all the f**king time, so not surprising.
