H-I-J '76 Nova re-fit. - Page 140

Dissident · 07-30-2019, 04:50 PM

Todd and Autumn,

Clip / Retainer come out and the pin slid out? What type of circlips were used? At what RPM did the thing come unwound? Bummer for sure.

You guys be tough and hang in there. Adversities makes one tougher, but it surely gets tedious at times.

Regards,
HB2

Dissident

Nmbr1GMfan · 07-30-2019, 06:08 PM

Quote:

Originally Posted by nickh

Todd pm sent.

Thanks, responded.

Nmbr1GMfan · 07-30-2019, 06:14 PM

Quote:

Originally Posted by Mark Yacavone

Todd, Do you have a pic of the other five pistons?

Mark, what would you like to see?

Nmbr1GMfan · 07-30-2019, 06:22 PM

Quote:

Originally Posted by Dissident

Todd and Autumn,

Clip / Retainer come out and the pin slid out? What type of circlips were used? At what RPM did the thing come unwound? Bummer for sure.

You guys be tough and hang in there. Adversities makes one tougher, but it surely gets tedious at times.

Regards,
HB2

Dissident

Yes, Kramm-Lox, 5500 rpm.

Nmbr1GMfan · 07-30-2019, 06:24 PM

Camshaft is on a 2 day trip to California.

Dissident · 07-30-2019, 07:31 PM

Todd,

Did the clip break the end off of one end? What did the end of the pin look like? Such as did it ride on the cylinder wall a bit before it cocked in the piston and jerked in out of shape?

An old guy's inquiring mind would like to know.

Thanks in advance.

Regards,
HB2

Dissident

Nmbr1GMfan · 07-30-2019, 07:54 PM

Quote:

Originally Posted by Dissident

Todd,

Did the clip break the end off of one end? What did the end of the pin look like? Such as did it ride on the cylinder wall a bit before it cocked in the piston and jerked in out of shape?

An old guy's inquiring mind would like to know.

Thanks in advance.

Regards,
HB2

Dissident

Lock never broke, it was pushed out, pin was on the cyl wall and pulling on one side of the piston so it was jammed up in there. And yes, all of the locks were measured to make sure they had the correct groove size. before install.

Mark Yacavone · 07-30-2019, 08:39 PM

Quote:

Originally Posted by Nmbr1GMfan

Lock never broke, it was pushed out, pin was on the cyl wall and pulling on one side of the piston so it was jammed up in there. And yes, all of the locks were measured to make sure they had the correct groove size. before install.

....Why I asked about the pistons..Should have mentioned the bottoms..not the tops ;-)

Nmbr1GMfan · 07-30-2019, 09:26 PM

Quote:

Originally Posted by Mark Yacavone

....Why I asked about the pistons..Should have mentioned the bottoms..not the tops ;-)

Obviously the one that broke had no lock but another had no lock and the pin was out and about to break that piston too, both locks in the oil pan. Also should mention that the correct pins with the chamfer for this type of lock were also in use here.

Rich Biebel · 07-30-2019, 09:53 PM

I’ve never seen or used those pin locks.

My own engine in my dragster has Diamond pistons and spiral locks the std. used for many years. Single or double and I’ve never had one break or come out.

It was s.o.p. to verify the pins had some clearance or movement between the locks. Every piston I assemble, I check to be sure the pin can rotate freely in the piston without binding on the locks.

Obviously something way wrong with the lock, piston, pin arrangement.

That was a real bad mess and should not have happened given they were all good name brand parts.

Years ago we used a snap ring type pin lock. Spiral locks became the normal lock usually used. The locks tend to dig into the groove and raise up a burr but unless they were not installed right, rarely failed.

Very ugly mess. I’ve seen plenty of blown up engines. It’s never pretty and always expensive.

Sorry to see it ....

07-30-2019, 04:50 PM	#1391
Dissident Member Join Date: Jan 2016 Location: Colorado hills Posts: 123 Likes: 11 Liked 73 Times in 36 Posts	Re: H-I-J '76 Nova re-fit. Todd and Autumn, Clip / Retainer come out and the pin slid out? What type of circlips were used? At what RPM did the thing come unwound? Bummer for sure. You guys be tough and hang in there. Adversities makes one tougher, but it surely gets tedious at times. Regards, HB2 Dissident

07-30-2019, 06:24 PM	#1395
Nmbr1GMfan VIP Member Join Date: Aug 2013 Posts: 1,766 Likes: 1,197 Liked 1,958 Times in 493 Posts	Re: H-I-J '76 Nova re-fit. Camshaft is on a 2 day trip to California. __________________ Todd Greene

07-30-2019, 07:31 PM	#1396
Dissident Member Join Date: Jan 2016 Location: Colorado hills Posts: 123 Likes: 11 Liked 73 Times in 36 Posts	Re: H-I-J '76 Nova re-fit. Todd, Did the clip break the end off of one end? What did the end of the pin look like? Such as did it ride on the cylinder wall a bit before it cocked in the piston and jerked in out of shape? An old guy's inquiring mind would like to know. Thanks in advance. Regards, HB2 Dissident

07-30-2019, 09:53 PM	#1400
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,275 Likes: 25 Liked 510 Times in 200 Posts	Re: H-I-J '76 Nova re-fit. I’ve never seen or used those pin locks. My own engine in my dragster has Diamond pistons and spiral locks the std. used for many years. Single or double and I’ve never had one break or come out. It was s.o.p. to verify the pins had some clearance or movement between the locks. Every piston I assemble, I check to be sure the pin can rotate freely in the piston without binding on the locks. Obviously something way wrong with the lock, piston, pin arrangement. That was a real bad mess and should not have happened given they were all good name brand parts. Years ago we used a snap ring type pin lock. Spiral locks became the normal lock usually used. The locks tend to dig into the groove and raise up a burr but unless they were not installed right, rarely failed. Very ugly mess. I’ve seen plenty of blown up engines. It’s never pretty and always expensive. Sorry to see it .... __________________ Rich Biebel S/C 1479