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Author Topic:   Dropped a valve
cpmaverick
Moderator

Posts: 1256
From: Auburn, AL.
Registered: Jan 2000

posted 03-09-2002 11:15 PM     Click Here to See the Profile for cpmaverick   Click Here to Email cpmaverick     Edit/Delete Message   Reply w/Quote
Well, I was doing a nice long wheelspin down the street (as usual ) and when I came to the stop sign I could tell I had a dead cylinder. My rev limiter is at 6200.

Pulled the valve cover and the #4 intake valve spring retainer broke in half. The keepers are both intact, and everything else seems OK. The valvespring is not broken. The valve fell and the piston pushed it into the head. The car ran fine, acted like a dead cylinder, didn't blow the dipstick out or anything so the piston might be OK.

Has anyone ever seen this happen before? They were Ford Motorsport steel retainers, keepers, and springs. GT40 valves. E7TE heads. The retainer sheared perfectly in half.

I've got my X303 ready to go in, hopefully the piston is not damaged. I just don't want this happening again. Suggestions?

------------------
-Charlie Ping
1970 Maverick Grabber
[email protected] with AC and overdrive.
http://www.maverickgrabber.com

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TomP
Gearhead

Posts: 3609
From: Delta BC Canada
Registered: Dec 99

posted 03-10-2002 03:40 AM     Click Here to See the Profile for TomP   Click Here to Email TomP     Edit/Delete Message   Reply w/Quote
Charlie

That kinda sucks!

I haven't seen retainers break like that

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Capri
Gearhead

Posts: 1163
From: Lyons, ILL, USA
Registered: May 99

posted 03-10-2002 10:04 AM     Click Here to See the Profile for Capri   Click Here to Email Capri     Edit/Delete Message   Reply w/Quote
Been there done that! Sometimes things just happen. It could have been a part failure, but it could have been caused by something else like too much spring presure. Im thinking it was a part failure. Hopefully the head is not severly damaged. Same for the piston. I have Comp stuff in stock Charlie. Keepers and retainers. Its what we use so if you need fresh stuff, let me know.

Tony

Tony

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kid vishus
Gearhead

Posts: 1994
From: huh?? what? who? ME!?!?!?!
Registered: Oct 2000

posted 03-10-2002 10:30 AM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
One other thing to worry about, hopefully when the valve hit the piston, it didnt cock the piston in the bore cracking that cylinder. I have done that before even when the piston wasnt hurt.

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cpmaverick
Moderator

Posts: 1256
From: Auburn, AL.
Registered: Jan 2000

posted 03-10-2002 07:41 PM     Click Here to See the Profile for cpmaverick   Click Here to Email cpmaverick     Edit/Delete Message   Reply w/Quote
Ouch! That's scary kid. I will be pulling the head to see in the next couple days. The springs are designed for the cam and the retainers are designed for the springs, so I would think that they should jive OK. I'm thinking part failure too.

I am on a tiny budget, especially right now. What are your opinions on just replacing the broken retainer? I don't think what it did is necessarily a sign that the others will do the same, but who knows.

I'm not sure what all new retainers would cost me either. It was a long time ago when I bought these.

------------------
-Charlie Ping
1970 Maverick Grabber
[email protected] with AC and overdrive.
http://www.maverickgrabber.com

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67coupe
Gearhead

Posts: 178
From: dallas NC usa
Registered: Nov 2000

posted 03-10-2002 10:33 PM     Click Here to See the Profile for 67coupe   Click Here to Email 67coupe     Edit/Delete Message   Reply w/Quote
my cleavland broke one aroune 3500 one day just crusing freak thing i guess i had new springs retainers locks and valves with bout 5,000 miles on them replaced the valve vhich it mutlated and the retainer and it now sees 7,000 reguraly so guess it was a freak thing well good luck

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Josh
67 coupe with 351c
94 Explorer
30 model A currently rustbucket
in process 67 convt with efi 5.0 and t5

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SteveLaRiviere
Administrator

Posts: 21832
From: Saco, Maine USA
Registered: May 99

posted 03-11-2002 07:50 AM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Sorry to hear of your mishap, Charlie.

I broke a Boss 351 retainer I was using once; it cracked in two across the diameter.

------------------

'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip

MCA Member # 47773

Always borrow money from a pessimist, they don't expect it back.

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2bav8
Gearhead

Posts: 174
From: Mesa, AZ
Registered: Jun 99

posted 03-12-2002 01:54 AM     Click Here to See the Profile for 2bav8   Click Here to Email 2bav8     Edit/Delete Message   Reply w/Quote
I dropped a valve driving to work once.
Was just crusing in 3rd gear about about 2200 rpm when I heard the most god aweful noise I had ever heard. A valve spring broke and the valve hit the piston, which then slammed into the cylinder wall, allowing tons of anti-freeze to hydro-lock the motor. The worst part was the motor only had less than 3000 miles on it.

------------------
2BAV8 Mustang
www.geocities.com/2bav8
[email protected]
1966 Restomod Coupe

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cpmaverick
Moderator

Posts: 1256
From: Auburn, AL.
Registered: Jan 2000

posted 03-18-2002 07:18 PM     Click Here to See the Profile for cpmaverick   Click Here to Email cpmaverick     Edit/Delete Message   Reply w/Quote
Well my machinist says he felt really bad about the retainer breaking. He looked at it and felt like it was defective.

He's going to fix my head for parts cost only, $54. The piston was fine.

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-Charlie Ping
1970 Maverick Grabber
[email protected] with AC and overdrive.
http://www.maverickgrabber.com

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steve'66
Gearhead

Posts: 3653
From: Sonoma,CA,USA
Registered: Mar 2000

posted 03-18-2002 08:10 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Charlie,

That's a good deal!

SteveW

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