Cracked flywheel with flathead c4

Reply Subscribe

Thread Tools

Search this Thread

Apr 15, 2013 | 01:55 PM

JohnS49

Thread Starter

Senior User

Joined: Dec 2010

Posts: 107

Likes: 0

From: Cen Tex

Cracked flywheel with flathead c4

I have a c4 hooked up to my flathead using a speedway adaptor kit . After about 2 years of driving the flywheel cracked . Contacted speedway and got a new flywheel . They said this was unusual and provided the new fly wheel at cost . Now after about 3 months of driving I belive this flywheel has cracked also . Will know for sure when we get into it . I don't think this is the result of a faulty product . Something is causing this but I don't know what .The mechanic shop I use is local, been in business many years , and I trust . Has anyone had this problem ? Or have any ideas on the cause .

Apr 15, 2013 | 03:58 PM

52 Merc

Hotshot

Joined: Oct 2009

Posts: 16,152

Likes: 4,750

From: Burbank, WA

Where is it cracking at? Between bolt holes? Somewhere else?

Apr 15, 2013 | 04:34 PM

JohnS49

Thread Starter

Senior User

Joined: Dec 2010

Posts: 107

Likes: 0

From: Cen Tex

As I recall the crack on the last one was on the inner part of the flywheel between bolt holes . We havn't got this one apart yet to check .

Apr 15, 2013 | 06:08 PM

ALBUQ F-1

Fleet Owner

Joined: Jul 2004

Posts: 27,287

Likes: 1,052

From: NM

That sounds like the adapter isn't centered properly, i.e., the t.c. centerline is offset from the engine centerline. That causes the flex plate to flex far more than it is designed for.

Apr 15, 2013 | 06:38 PM

4tl8ford

Post Fiend

Joined: Jun 2001

Posts: 7,493

Likes: 7

From: Erie, pa

There should be offset pins on the bellhousing

Apr 15, 2013 | 10:17 PM

ALBUQ F-1

Fleet Owner

Joined: Jul 2004

Posts: 27,287

Likes: 1,052

From: NM

Quote:

Originally Posted by 4tl8ford

There should be offset pins on the bellhousing

You mean in the adapter?

Apr 16, 2013 | 05:25 AM

big job

Fleet Mechanic

Joined: Dec 2005

Posts: 1,602

Likes: 44

You got some flexing going on. Something not concentric-- break out the
dividers micrometers and dial indicators. How is the converter seal
holding up??