|
|
|
|
| Author |
|
|
Registered
Join Date: Dec 2007
Posts: 65
|
2.7 Rebuild: Can the valve springs be reused
I am having my 2.7 rebuilt. The re-builder today sent me an estimate that Included new valve springs. I went over the rebuild list and He is charging 267 for a set of new springs which sounds like a fair price. He also said that the old springs could possibly be reused if they are within tolerance. So far on the heads he is installing new exhaust guides and valves and reusing the intakes. I am leaving the cams stock along with the pistons and cylinders. So what would you guys do? The motor had 124K on it when I pulled it with decent compression but loose exhaust valves.
|
||
02-06-2008, 04:23 PM
|
|
|
abit off center
|
In spec, use them.. Must be the intake valves are ok because he is reusing them?
__________________
______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. |
||
|
02-06-2008, 04:40 PM
|
|
|
Registered
Join Date: Dec 2007
Posts: 65
|
Yes he is reusing the intake valves and installing new guides in both intake and exhaust
|
||
|
02-06-2008, 06:07 PM
|
|
|
Registered
Join Date: May 2003
Posts: 3,346
|
There is no need to replace them if they are in spec. I would feel more comfortable using the old springs that have a history of service than new. There can be flaws in new parts that cause early failures. Rod bolts are a good example (they have to be replaced, but some have flaws and fail).
-Andy
__________________
72 Carrera RS replica, Spec 911 racer |
||
|
02-07-2008, 10:05 AM
|
|
|
Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,079
|
I would be more apt to use new valves and not worry about springs. Facing a valve is more work then a new one. What is more I would absolutely replace the EX valves
__________________
D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
||
|
02-12-2008, 05:20 PM
|
|
|
Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,451
|
how about the valve stems? did he mic them along their length to see if they're tapered? springs, if they're a tad weak when checked on a valve spring gauge, you can add a shim or two to bring them up to spec.
__________________
https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 Last edited by john walker's workshop; 02-12-2008 at 05:58 PM.. |
||
|
02-12-2008, 05:53 PM
|
|
|
|
Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,079
|
That goes W.O. saying...or or thats what i thought
__________________
D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
||
|
02-12-2008, 05:56 PM
|
|
|
Registered
Join Date: Dec 2007
Posts: 65
|
I stopped by the re-builder and checked the parts out. Without any question the exhaust valves were already scheduled for the trash. They had done the first grind/face on the intakes to make sure that they could take a grind. Both the intake and exhaust guides will be replaced. So far we are reusing the springs. This will not be a high RPM motor. Basically a stock rebuild.
|
||
|
02-12-2008, 07:29 PM
|
|
1969 and 1986 Porsche Targa and Coupe 1720cc and 3
