Show full size 924Board.org
Discussion Forum of 924.org
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
 Technical FAQ924 FAQ (Technical)   Technical924 Technical Section   Jump to 924.org924.org   Jump to PCA 924 Registry924 Registry

Head Rebuild - One from Two (Advice Please)

 
Post new topic   Reply to topic    924Board.org Forum Index -> Performance Upgrades
View previous topic :: View next topic  
Author Message
XLR8  



Joined: 30 Mar 2016
Posts: 129
Location: Byron Bay, Australia

PostPosted: Sun Jan 26, 2020 7:21 am    Post subject: Head Rebuild - One from Two (Advice Please) Reply with quote

I have a head recently removed from the car with a burnt exhaust valve. Otherwise looks to be in very good shape.

I have another valvetrain/cam/etc (completely disassembled) that I won't be using due to some cracking of that head casting.

Is it feasible to replace the burnt exhaust valve with one from the other head?

Just pop a new valve in place and grind the seat, or is there more required for a reasonable job. Thinking of valve seals and buckets here ....

Note: I would likely get the head skimmed prior to replacing the valve.
_________________
'81 Porsche 924 NA
'89 Eunos Roadster NA6
'06 Landcruiser HDJ100
Back to top
View user's profile Send private message
Paul  



Joined: 02 Nov 2002
Posts: 9451
Location: Southeast Wisconsin

PostPosted: Sun Jan 26, 2020 10:02 am    Post subject: Reply with quote

Used valve should be fine, no need to replace the bucket since it is already worn into the cam. I always replace valve seals when the springs are off.
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.
Back to top
View user's profile Send private message Send e-mail
XLR8  



Joined: 30 Mar 2016
Posts: 129
Location: Byron Bay, Australia

PostPosted: Mon Jan 27, 2020 7:18 am    Post subject: Reply with quote

Thanks Paul, that makes sense. I'll grab a full gasket kit with the valve seals in it so I am ready to go once putting the engine together.
_________________
'81 Porsche 924 NA
'89 Eunos Roadster NA6
'06 Landcruiser HDJ100
Back to top
View user's profile Send private message
MikeJinCO  



Joined: 08 Jun 2010
Posts: 929
Location: Maysville, Colorado

PostPosted: Mon Jan 27, 2020 7:36 am    Post subject: Reply with quote

Check all the old exhaust valves for wear on stem,a sort of brownish area,many times a wear edge felt with fingernail. Obviously use the best one. Also check the valve guides for wear by wobbling valve. Guides are cheap and easy to replace by any head repair shop.
_________________
Mike
Poco a Poco, #033 '78 Vintage racer, SCCA Dp-81
'77 924
cricketdesigns.com
Back to top
View user's profile Send private message Visit poster's website
XLR8  



Joined: 30 Mar 2016
Posts: 129
Location: Byron Bay, Australia

PostPosted: Mon Jan 27, 2020 7:42 am    Post subject: Reply with quote

Thanks MikeJinCo. Good advice. I am planning to get the machine shop to clean and skim the head, and do the rest myself.

I recently had them do a full head rebuild, and it wasn't cheap and I worked out most of it I could have done myself.
_________________
'81 Porsche 924 NA
'89 Eunos Roadster NA6
'06 Landcruiser HDJ100
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    924Board.org Forum Index -> Performance Upgrades All times are GMT + 10 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group