Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

 
 Reply to this topicStart new topic
> In place head refresh, head refresh question
tomrev
post May 28 2015, 09:39 AM
Post #1


Member
**

Group: Members
Posts: 231
Joined: 25-February 14
From: N. Mich.
Member No.: 17,037
Region Association: None
Can't find anything in search; I have a '72 1.7 with one cyl. at zero comp. Appears to be exhaust valve. Because all else is very good, I'm thinking of leaving the drivetrain in place, and removing the head for repair. Have you done this? Am I a dolt to not drop the engine? Appreciate feedback! Tom
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post May 28 2015, 09:59 AM
Post #2


914 Idiot
**********

Group: Members
Posts: 14,986
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
Yes, you're a dolt for not dropping the engine to do this job. (IMG:style_emoticons/default/wink.gif) It's four big bolts to drop (plus a few other things). I don't think the heads can move out far enough to come off the head studs if you leave the engine in place, so your choices are taking a sawz-all to the suspension pickup points (not recommended) or removing the head studs (also not recommended).

Seriously, though, dropping the engine is not a big deal and working around the chassis/body is a huge deal in this case.

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
toon1
post May 28 2015, 10:04 AM
Post #3


Senior Member
***

Group: Members
Posts: 1,849
Joined: 29-October 05
From: tracy,ca
Member No.: 5,022
Drop the engine!!! You'll be thanking yourself later.

It also gives you a chance to clean everything up.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Elliot Cannon
post May 28 2015, 11:06 AM
Post #4


914 Guru
*****

Group: Retired Members
Posts: 8,487
Joined: 29-December 06
From: Paso Robles Ca. (Central coast)
Member No.: 7,407
Region Association: None
Drop the engine. Do both heads at the same time. And while you're in there... (IMG:style_emoticons/default/biggrin.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
tomrev
post May 28 2015, 11:51 AM
Post #5


Member
**

Group: Members
Posts: 231
Joined: 25-February 14
From: N. Mich.
Member No.: 17,037
Region Association: None
QUOTE(Elliot Cannon @ May 28 2015, 09:06 AM) *

Drop the engine. Do both heads at the same time. And while you're in there... (IMG:style_emoticons/default/biggrin.gif)



Thanks everybody; makes sense. Back a few decades with my six I could drop it out in about 45 min. I'm just getting lazy. Also, the "while your in there" thinking will be firmly ignored, as I know where that leads, and this is not that kind of car!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Spoke
post May 28 2015, 02:03 PM
Post #6


Jerry
*****

Group: Members
Posts: 6,978
Joined: 29-October 04
From: Allentown, PA
Member No.: 3,031
Region Association: None
The only big job I've done without dropping the engine was change the clutch. Trans came out ok and I was able to do everything including replace the flywheel with no trouble.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
somd914
post May 28 2015, 02:53 PM
Post #7


Member
***

Group: Members
Posts: 1,171
Joined: 21-February 11
From: Southern Maryland
Member No.: 12,741
Region Association: MidAtlantic Region
QUOTE(Spoke @ May 28 2015, 04:03 PM) *

The only big job I've done without dropping the engine was change the clutch. Trans came out ok and I was able to do everything including replace the flywheel with no trouble.


(IMG:style_emoticons/default/agree.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Cairo94507
post May 28 2015, 03:57 PM
Post #8


Michael
*****

Group: Members
Posts: 9,759
Joined: 1-November 08
From: Auburn, CA
Member No.: 9,712
Region Association: Northern California
Come on now..... once you get the engine out it is the perfect time to degrease and clean the engine bay. Then spruce it up with some color. Be sure to check the battery box, long, firewall, suspension mounting points, OH, I see where this is headed! At least clean the engine up and power wash the engine bay (IMG:style_emoticons/default/biggrin.gif) .
User is online!Profile CardPM
Go to the top of the page
+Quote Post
stugray
post May 28 2015, 04:07 PM
Post #9


Advanced Member
****

Group: Members
Posts: 3,824
Joined: 17-September 09
From: Longmont, CO
Member No.: 10,819
Region Association: None
Once you start cleaning it goes downhill from there RAPIDLY!

Just one more screw & I can get behind that next piece! ..... (IMG:style_emoticons/default/sawzall-smiley.gif) (IMG:style_emoticons/default/welder.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
toon1
post May 28 2015, 04:16 PM
Post #10


Senior Member
***

Group: Members
Posts: 1,849
Joined: 29-October 05
From: tracy,ca
Member No.: 5,022
QUOTE(stugray @ May 28 2015, 03:07 PM) *

Once you start cleaning it goes downhill from there RAPIDLY!

Just one more screw & I can get behind that next piece! ..... (IMG:style_emoticons/default/sawzall-smiley.gif) (IMG:style_emoticons/default/welder.gif)


Yep!...next thing you know the car is on jack stands for 6 months
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
worn
post May 28 2015, 04:50 PM
Post #11


can't remember
****

Group: Members
Posts: 3,156
Joined: 3-June 11
From: Madison, WI
Member No.: 13,152
Region Association: Upper MidWest
QUOTE(tomrev @ May 28 2015, 08:39 AM) *

Can't find anything in search; I have a '72 1.7 with one cyl. at zero comp. Appears to be exhaust valve. Because all else is very good, I'm thinking of leaving the drivetrain in place, and removing the head for repair. Have you done this? Am I a dolt to not drop the engine? Appreciate feedback! Tom


Someone reported doing it about a year ago here. May be hard to find the thread. They were trying to get to a con rod bearing.

And yes, even though they pulled it off they would have been far far better off dropping the engine. Put it another way. The only way to even think about this would be with the car on a lift so you have plenty of room to get to the tight spots. Once you have it on the lift it is nuts not to drop the engine. I won't call it easy cause I have only done it once. But it wasn't nearly as hard as replacing an oil pump with engine in. Easier than an alternator swap. or just about.

Then you are almost certain to pull both heads and do the whole top end. But why go to all that work, button it up and then find out you have to.

How many miles? Bearings good with good oil pressure? My strategy was build another engine first and then I had something to swap in without the jack stand wait.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 16th May 2024 - 04:44 PM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...