Found another broken retainer tonight
Registered User
Joined: Feb 2004
Posts: 7,087
Likes: 2
From: Dry Branch
Originally Posted by Jsmply,Jul 17 2006, 02:22 AM
Thats true I didn't think about it that way. But is my understanding correct, is he saying that a 2.2L would not limp along showing no symptoms with a cracked retainer, but rather just blow up? That being so if you had an over-rev that caused damage you'd know instantly? Just curious as it would be good information to spread around as it might keep a few less "did I do any damage" threads from starting (at least from ap2 owners).
However, I gotta tell ya, if my car were an AP2 and I over reved the motor I'd want to pull the cam/rocker cover and take a look anyway. I might even want to put a bore scope in the spark plug holes and take a look around (which I don't do with my AP1, because I figure if the keepers are OK I haven't had any valve-piston contace.
I think that's the advice I'll go with until I have more information. As far as I know we have yet to see an AP2 with stretched/cracked retainers, but if it were my car I'd check them anyway, because it's an easy job and cheap insurance. Certainly taking a few minutes to take a look won't hurt anything.
Registered User
Joined: Feb 2004
Posts: 7,087
Likes: 2
From: Dry Branch
Originally Posted by dhayner,Jul 17 2006, 01:51 PM
When the retainer stretches enough, the keeper slips through the enlarged hole and no longer "keeps" the valve.
Bill, do you know the failure mode here? Do the keepers pull through the retainer, or do they let go of the valve stem?
Registered User
Joined: Jun 2004
Posts: 1,724
Likes: 0
From: Miami, FL
Originally Posted by RED MX5,Jul 17 2006, 03:05 PM
If I'm understanding Bill correctly he is saying that there is no need to inspect an F22C after an over rev becasue they'll show the effects of any damage immediately, and if that's the case we certainly don't need to be telling AP2 owners that they need to inspect their retainers after an over rev.
However, I gotta tell ya, if my car were an AP2 and I over reved the motor I'd want to pull the cam/rocker cover and take a look anyway. I might even want to put a bore scope in the spark plug holes and take a look around (which I don't do with my AP1, because I figure if the keepers are OK I haven't had any valve-piston contace.
I think that's the advice I'll go with until I have more information. As far as I know we have yet to see an AP2 with stretched/cracked retainers, but if it were my car I'd check them anyway, because it's an easy job and cheap insurance. Certainly taking a few minutes to take a look won't hurt anything.
However, I gotta tell ya, if my car were an AP2 and I over reved the motor I'd want to pull the cam/rocker cover and take a look anyway. I might even want to put a bore scope in the spark plug holes and take a look around (which I don't do with my AP1, because I figure if the keepers are OK I haven't had any valve-piston contace.
I think that's the advice I'll go with until I have more information. As far as I know we have yet to see an AP2 with stretched/cracked retainers, but if it were my car I'd check them anyway, because it's an easy job and cheap insurance. Certainly taking a few minutes to take a look won't hurt anything.
Thread Starter
Moderator
Joined: Jul 2002
Posts: 22,386
Likes: 1,838
From: Long Island, New York
Originally Posted by RED MX5,Jul 17 2006, 04:09 PM
It is an assumption on my part, but I have always assumed that the stretched retainers allowed the keepers to seperate enough to lose their grip on the grove in the valve stem. This would allow the valve spring to shoot the retainer and keepers upward as the valve falls down into the cylinder.
Bill, do you know the failure mode here? Do the keepers pull through the retainer, or do they let go of the valve stem?
Bill, do you know the failure mode here? Do the keepers pull through the retainer, or do they let go of the valve stem?
Registered User
Joined: Feb 2004
Posts: 7,087
Likes: 2
From: Dry Branch
Originally Posted by Jsmply,Jul 17 2006, 04:28 PM
Oh I agree you cannot be to careful, however I am very intrigued by what Bill said. Hopefully he chimes in with more input.
Bill is "the man." 