|
|
|
|
| Author |
|
|
Hbrand
|
Valve guides loose
Engine is running OK. Some blue smoke, removed exhaust system to check and found #3 and #6 valve guide loose.
Is it possible to remove springs, slide out the guide, use red thread locker and install all back ?? First picture shows the guide is all the way in, second picture shows the "sliding" guide Greetings, Harold  
__________________
Cheers 1982 Porsche 911SC Euro 1969 Mercedes 280SL 1956 Austin Healey 3x |
||
02-12-2022, 05:36 AM
|
|
|
Registered
Join Date: Mar 2019
Posts: 1,619
|
No. It's not possible. You need to remove the engine and disassemble far enough to remove the cylinder heads. They're a interference (press) fit.
|
||
|
02-12-2022, 07:16 AM
|
|
|
Registered
|
Yep - only one course here. Tear it down.
The guide will also have flogged the fitting in the head. It will need replacement ones machined down to the appropriate tolerance for the damaged seats - which will probably need to be cleaned up as well. Basically match interference fits. If you try some temp remedy as you suggest, you will just make things worse. Be prepared for 'while you are in there'........ Alan
__________________
83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
||
|
02-12-2022, 10:11 AM
|
|
|
Hbrand
|
Yes, will do a complete rebuild incl. Splitting the case
Thank you |
||
|
02-13-2022, 09:18 AM
|
|
|
Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,453
|
There will be issues with the guide bore being worn oversize. That will require machining of the bore so it's straight and true and custom oversize guides. Might be easier to find another matching good head(s). The seats must be recut after guide replacement.
__________________
https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
||
|
02-16-2022, 09:52 PM
|
|
|
Registered
Join Date: May 2004
Posts: 875
|
Oversize guides are common. 0.513" is std from memory and 0.516: I think is the OS.
From looking at the photos, you will be into the heads for more than just guides. As the above post correctly points out, you may have to have a custom guide made. This is not difficult as blanks are available. Disassemble and clean the heads and go from there. Things to check are, cracks around the guide boss, guide bore size, Valve stem wear, seat heights, any damage on the spring side. |
||
|
02-17-2022, 07:14 AM
|
|
|
Porsche 911SC Euro
Austin Helaye 100-4
