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Old 01-21-2012, 22:46   #1 (permalink)
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Question oily plugs on one bank

Hi
I have 76 F350 has a 400 engine with oily spark plugs on the left bank only.
The right bank is ok.
All 4 plugs on the left bank are oily.
If it was one plug i could understand, but all 4 on only one bank i dont understand.
Its not the carbs fault i just rebuilt it.

Can someone tell me what could be causing this??

thanks
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Old 01-26-2012, 16:36   #2 (permalink)
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Re: oily plugs on one bank

Only thing that comes to mind is the oil return passages are blocked causing the oil to build up around the intake valve stems.
The stem seals are old and not controlling the oil along with stem and guide wear.
Good luck.
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Old 01-28-2012, 18:03   #3 (permalink)
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Question Re: oily plugs on one bank

Ok thanks Bluegrass

If I take the valve cover off can I see the oil return passages ??
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