Broken valve spring., Valve spring is broken. |
|
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. |
|
Broken valve spring., Valve spring is broken. |
mbseto |
Aug 16 2014, 04:02 PM
Post
#1
|
Senior Member Group: Members Posts: 1,253 Joined: 6-August 14 From: Cincy Member No.: 17,743 Region Association: North East States |
Hey all;
New 914 owner here. Just got a '71 1.7 with no compression in cyl #3. Popped the valve cover and there is a broken spring. Anyone tried to replace this with the engine in? Got a manual that only addresses the situation where the engine in on the bench. Thanks all, hope the BBQ is going well. Matthew. |
Mark Henry |
Aug 16 2014, 04:22 PM
Post
#2
|
that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
|
mbseto |
Aug 16 2014, 04:42 PM
Post
#3
|
Senior Member Group: Members Posts: 1,253 Joined: 6-August 14 From: Cincy Member No.: 17,743 Region Association: North East States |
|
brant |
Aug 16 2014, 05:05 PM
Post
#4
|
914 Wizard Group: Members Posts: 11,584 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains |
I've done it in the car. Made a tool once upon a time.
|
stugray |
Aug 16 2014, 05:08 PM
Post
#5
|
Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
I have read that you can use air pressure through the spark plug hole to hold the valve closed while removing/replacing springs, but I have never tried it.
|
mbseto |
Aug 16 2014, 05:35 PM
Post
#6
|
Senior Member Group: Members Posts: 1,253 Joined: 6-August 14 From: Cincy Member No.: 17,743 Region Association: North East States |
So Brant, was your tool to put air pressure in the cylinder? Spark plug thread with a quick-disconnect? I can make something like that... Saw a video of a guy pushing the retainer in with vise grips to get the retainer in place. Am I thinking along the right lines? Thanks for the responses...
|
stugray |
Aug 16 2014, 06:40 PM
Post
#7
|
Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
You need the type of compression tool that would bolt down where the rocker arms bolt.
Then you pressurize thru the plug hole to hold the valve out and press the sprig down over it. To talk about trying this with the engine in the car is kind of crazy. If the engine is out, you can have the head off in about an hour. |
swooshdave |
Aug 17 2014, 12:40 AM
Post
#8
|
Member Group: Members Posts: 184 Joined: 11-June 14 From: Portland Member No.: 17,475 Region Association: Pacific Northwest |
I have heard of people suffing a string in the spark plug hole to stop the valve from moving. Make sure you leave a little hanging out.
(IMG:style_emoticons/default/smile.gif) |
Dr Evil |
Aug 17 2014, 07:22 AM
Post
#9
|
Send me your transmission! Group: Members Posts: 22,993 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region |
Dang, that is tough. Good to see another guy in OH. About to move near there (IMG:style_emoticons/default/smile.gif)
|
r_towle |
Aug 17 2014, 08:18 AM
Post
#10
|
Custom Member Group: Members Posts: 24,499 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
If you use a shop rag and slowly stuff it in the spark plug hole, then raise the pistons to TDC, you should be able to replace that....if you are using stock springs.
The trick will be getting the spring cap and keepers in place. I would suggest you take a piece of steel pipe and carve out a U shape about 1 inch high at the bottom of the pipe....on both sides. So, you end up with two legs on the pipe about 3/4 of an inch wide. Using the pipe to push down on both the spring and the cap you might be able to get the keepers in place. The stock springs are not super stiff, so it can be done without taking the motor apart, and just knowing that others have done it may get you through it. rich |
brant |
Aug 17 2014, 08:47 AM
Post
#11
|
914 Wizard Group: Members Posts: 11,584 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains |
So Brant, was your tool to put air pressure in the cylinder? Spark plug thread with a quick-disconnect? I can make something like that... Saw a video of a guy pushing the retainer in with vise grips to get the retainer in place. Am I thinking along the right lines? Thanks for the responses... the tool was a 6inch piece of flat stock with a Y on the end. I believe we bolted it to a rocker stand with the ability to pivot then the Y was to put the retainer/keeper on while compressing the spring we used air at the same time to hold the valve out it wasnt that bad in the car pull the exhaust would be super easy out of the car on the floor even... but not impossible in the car. |
Mark Henry |
Aug 17 2014, 10:14 AM
Post
#12
|
that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
|
Bills914-4 |
Aug 17 2014, 06:40 PM
Post
#13
|
Member Group: Members Posts: 310 Joined: 1-March 08 From: suburbs of Miami FL. Member No.: 8,762 Region Association: South East States |
I've used this tool from RJE (rocky jennings enterprise ) , I modified it for type 4
by cutting the bar (type4 length) & drilling a new hole , I was able to use it from under the car , I think I also bent the curved handle a little more so it wouldn't hit the suspension ear , Bill D. http://www.rockyjennings.com/ go to tools & then to valve spring compressor |
Brian_Boss |
Aug 17 2014, 09:37 PM
Post
#14
|
Member Group: Members Posts: 324 Joined: 3-June 03 From: Dallas, TX Member No.: 781 |
I'm not necessarily advocating this approach but I have replaced a spring without dropping the motor or any special tools. I used parts from my compression tester to pressurize the cylinder to hold the valve. I compressed the new spring in a vice and wrapped it on two sides with a couple turns of safety wire. Installed the spring, retainer and keepers then cut the wire. I know, very Grapes of Wrath, but I needed to get the car running. YMMV, etc....
|
mbseto |
Aug 18 2014, 08:12 AM
Post
#15
|
Senior Member Group: Members Posts: 1,253 Joined: 6-August 14 From: Cincy Member No.: 17,743 Region Association: North East States |
"1.7? sad.gif "
Eventual goal is a Suby... Not sure why it broke, I bought it this way. We were able to start it and drive it on to the trailer. No sounds of colliding metal, so the plan has been to repair what I find and then see what happens. Brian, I like your idea... It might be a moot point though. Upon further inspection, the pushrod end is chewed up, and the frame prevents me from pulling it out. I'd cut it, but still wouldn't be able to get the new one in. I was hoping to get the engine running without having to pull it, but this looks inevitable now... Thanks for all the responses. |
ThePaintedMan |
Aug 18 2014, 08:19 AM
Post
#16
|
Advanced Member Group: Members Posts: 3,884 Joined: 6-September 11 From: St. Petersburg, FL Member No.: 13,527 Region Association: South East States |
You can definitely get the pushrod out without pulling the motor. Just gotta some wiggling.
I like the safety-wired spring idea. A lot of aftermarket coil springs come pre-compressed like that. I used Bill's tool that he mentioned and it worked like a charm. One day I'm going to go ahead and buy one of my own. (IMG:style_emoticons/default/beerchug.gif) |
ChrisFoley |
Aug 18 2014, 11:08 AM
Post
#17
|
I am Tangerine Racing Group: Members Posts: 7,894 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None |
It might be a moot point though. Upon further inspection, the pushrod end is chewed up, and the frame prevents me from pulling it out. I'd cut it, but still wouldn't be able to get the new one in. Pull the pushrod tube at the same time. That way you can aim the pushrod at the angle necessary to get past the chassis. |
PotterPorsche |
Aug 18 2014, 11:43 AM
Post
#18
|
Member Group: Members Posts: 295 Joined: 10-November 13 From: Hayward CA Member No.: 16,628 Region Association: None |
|
mbseto |
Aug 18 2014, 01:41 PM
Post
#19
|
Senior Member Group: Members Posts: 1,253 Joined: 6-August 14 From: Cincy Member No.: 17,743 Region Association: North East States |
Will try to pull the tube and report back. Thanks for the help everyone...
|
Dave_Darling |
Aug 18 2014, 09:07 PM
Post
#20
|
914 Idiot Group: Members Posts: 14,974 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
Pull the tube partway out (it slides in through the head!) and tilt the inboard end down. You should be able to slide it out at that point, together with the pushrod.
--DD |
Lo-Fi Version | Time is now: 28th March 2024 - 11:42 AM |
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 ... |