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Back from Beyond
Join Date: Nov 2004
Location: Alberta, Canada
Posts: 2,697
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Need tips for reaming valve guides
Anyone done this? Shop guy says #3 exhaust is too tight - after he broke that valve spring on install and quizzed all the valves.
Specs should be: rock .8mm at 10mm lift, guide bore 9 to 9.015mm Is this right? And can we have at it with a reamer? Also, what's oil clearance supposed to be? Any help much appreciated. I have the parts to put the motor back together and this is the last hurdle. |
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10-17-2013, 12:21 PM
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Registered
Join Date: Apr 2010
Posts: 3,003
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You can get carbon deposits in the guide leading to stuck valves and stuff but at the same time having the guide worn beyond spec. It happens all the time to small Lycoming engines. Ream it and see what happens...
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10-17-2013, 12:38 PM
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Proprietoristicly Refined
Join Date: Jul 2001
Location: ~Carefree Highway~
Posts: 5,833
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"Is this right"
Looks right:  OEM Valve guides and valves were used correct? and not aftermarket BMW/VW? JR appears to have the answer . GL J_AZ
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1988 924S, 85,750K ..+ 1987 924S, 154K DD (+15K est. bad odo) |
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10-17-2013, 12:49 PM
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Back from Beyond
Join Date: Nov 2004
Location: Alberta, Canada
Posts: 2,697
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Stand by to ream!
Don't know origin of guides/valves. First time head came off this car, and all it needed was a refresh, not serious work. So valves have been run in, things tidied up...you know? He's really happy with it. 'It's almost perfect! Just that !#%#ing exhaust valve!' he says. |
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10-17-2013, 01:05 PM
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944 addict
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Isn't it always "just one thing"?
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3 944's, 2 Boxsters and one Caman S, and now one 951 turbo. Really miss the Cayman. Some people try to turn back their "odometers." Not me. I want people to know 'why' I look this way. I've traveled a long way and some of the roads weren't paved. |
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10-17-2013, 02:32 PM
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Back from Beyond
Join Date: Nov 2004
Location: Alberta, Canada
Posts: 2,697
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So true! But this time.....
I have all the parts. I have a plan. I have the right tools (mostly). Reassembly begins this weekend. Of course, my DD needs attention before the snow flies. Thanks for the replies, gents. The valve job is now comfortably within the realm of the familiar. Wish us luck! John, I'll be photographing the flex disc to clutch conversion and a write-up will be forthcoming. |
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10-17-2013, 04:38 PM
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Porsche 944 NA
1986 Porsche 951
