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#1
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Shavings
I've put about 3900 miles on a freshley rebuilt engine and am having some concerns. I change my oil about twice a month and have noticed metal shavings covering my magnetic oil plug. Looks like a porcupine. I undersand some shavings in the oil after a rebuild maybe the 1st or 2nd change But it dosn't ease up, in fact it's getting worse. And have noticed the idle is slowley deteriorating as well. What could cause this and where should i start looking? Thanks
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#2
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Re: Shavings
Hate to say it, but it might be a cam lobe/lifter going south.
__________________
Ken Mosher 1987 GN original owner 650+ HP Black 2015 BMW 328xi XDrive wagon 2012 Volkswagen Tiguan (the Tig!) Night Blue Met (sold) 2006 Trailblazer SS Red Jewel Tint 395 HP AWD (sold) 2014 Silverado LTZ Crew 4WD 2012 Honda VFR 1200F Tahitian Blue (sold) 2015 BMW S1000R Racing Red 2013 Honda CBR500R Red (wife's bike) 2014 Triumph Bonneville T100 2003 Harley Davidson V Rod Anniversary Edition |
#3
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Re: Shavings
Can you describe how your rebuilt motor was broken in? I'm interested to know how the motor was handled at the very first start up after the rebuild. Was the cam replaced? Were new lifters installed? What's your oil pressure at various operating conditions; idle, 2K rpm, etc?
Thanks.
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Paul Fredricks pfredricks@gnttype.org |
#4
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Re: Shavings
Thanks for the inquiries. The motor was broken in by doing moderate (~ half throttle) accelerations from medium to high RPM over and over, And a few WOT blasts the first 100 miles. The next 200 miles the rpms were kept below 3500. All of my clearances are very tight due to dry film coatings on all bearings and piston skirts. A HV oil unit was used with this rebuild so pressure is real high. Almost too high. Idle right now is 28PSI fully warmed up, and 3100 rpm it's @ 78PSI (cruising@100mph). New cam along with the rebuild and new lifters as well.
Last edited by And87mnr; 06-07-2005 at 03:19 PM. |
#5
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Re: Shavings
I was specifically interested to hear how you broke in the new cam. The usual procedure is to run the engine at 2000-3000 rpm for 20-25 minutes on the very first start up.
Was this done?
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Paul Fredricks pfredricks@gnttype.org |
#6
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Re: Shavings
Well the cam was broken in by holding the RPM's at 2500 rpm for ~15-20 minutes.
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#7
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Re: Shavings
Who manufactured the cam shaft?
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Paul Fredricks pfredricks@gnttype.org |
#8
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Re: Shavings
Comp cams is the manufacturer.
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#9
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Re: Shavings
I guess it could be a lobe or lifter, but it is a new cam . Other than tearing it down again are there any tests i can try or anything i can look at to better narrow down the possibilities?
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#10
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Re: Shavings
Quote:
That could point out an obviously bad cam/lifter.
__________________
Ken Mosher 1987 GN original owner 650+ HP Black 2015 BMW 328xi XDrive wagon 2012 Volkswagen Tiguan (the Tig!) Night Blue Met (sold) 2006 Trailblazer SS Red Jewel Tint 395 HP AWD (sold) 2014 Silverado LTZ Crew 4WD 2012 Honda VFR 1200F Tahitian Blue (sold) 2015 BMW S1000R Racing Red 2013 Honda CBR500R Red (wife's bike) 2014 Triumph Bonneville T100 2003 Harley Davidson V Rod Anniversary Edition |
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