LT5 Assembly Project - Page 3 - ZR-1 Net Registry Forums

LGAFF · 10-19-2008

The Pistons have damage from a screw...apparently the culprit was never found, but he either had partners or possibly bounced around from cylinder to cylinder:

There is however no damage to liners.

LGAFF
92 ZR1
#234

LGAFF · 10-19-2008

The only known other issue is the cross threaded bolt for the IH:

LGAFF
91 ZR1
#234

LGAFF · 10-19-2008

Step one in inspecting the block, etc was the removal of the balancer.

In order to hold the crank still, I placed a large head screwdriver in the crank position sensor hole, the crank has several notches in it, used for holding the crank still during cam timing. There is actually a tool that is inserted here that snaps into the notch and holds the crank still, but more to come on that. After locking the crank I removed the crank/balancer bolt.

Crank position sensor hole:

Then removed the balancer:

LGAFF

Zr1 Destroyer · 10-19-2008

Quote:

Originally Posted by phrogs

I still have to pull up the BS flag on the head bolts...

Who else here has worked on a LT5 and replaced the head bolts?

just curious

I re-used my bolts from my 368 for the 415 build and all is fine.......just turned them a few extra degrees with the wheel on the end of the torque wrench. I also re-used my head bolts on my old Z when I did the ported lpe heads from nj.

-=Jeff=- · 10-19-2008

Yeah but LGAFF has NO Head Bolts.. that is the issue

Zr1 Destroyer · 10-19-2008

Quote:

Originally Posted by LGAFF

Step one in inspecting the block, etc was the removal of the balancer.

In order to hold the crank still, I placed a large head screwdriver in the crank position sensor hole, the crank has several notches in it, used for holding the crank still during cam timing. There is actuall a tool that is inserted here in that snaps into the notch and holds the crank still, but more to come on that. After locking the crank I removed the crank/balancer bolt.

Crank position sensor hole:

Yeah....you'll for sure want the crank pin tool....things will get ugly real fast if a guy guess's on that one.

Zr1 Destroyer · 10-19-2008

Quote:

Originally Posted by -=Jeff=-

Yeah but LGAFF has NO Head Bolts.. that is the issue

Hmmm...nj has a surplus on these.....I'll ask him if he wants to get rid of some. He also has five extra sets of cams also he wants to punt.

LGAFF · 10-19-2008

It seems to me the tool is only needed to locate the proper hole, which I believe they state is at about 51 degress BTDC. The hole for cam timing is deeper that the others, and the pin tool drops flush in the proper notich. I would think that one could use a measured dowel to accomplish the same running a few rotations to ensure that you chose the correct notch.

LGAFF
92 ZR1
#234

Zr1 Destroyer · 10-20-2008

Quote:

Originally Posted by LGAFF

It seems to me the tool is only needed to locate the proper hole, which I believe they state is at about 51 degress BTDC. The hole for cam timing is deeper that the others, and the pin tool drops flush in the proper notich. I would think that one could use a measured dowel to accomplish the same running a few rotations to ensure that you chose the correct notch.

LGAFF
92 ZR1
#234

You could for sure do that, but the pin lock tool was in hand at the time of my build and made life easy for a moment during my last build.

10-20-2008

Quote:

Originally Posted by LGAFF

In order to hold the crank still, I placed a large head screwdriver in the crank position sensor hole, the crank has several notches in it, used for holding the crank still during cam timing. There is actually a tool that is inserted here that snaps into the notch and holds the crank still, but more to come on that. After locking the crank I removed the crank/balancer bolt.

So you are forcing roughly 160+ ftlbs of pressure on the crank reluctor wheel?

10-19-2008	#21
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,191	Re: LT5 Assembly Project The Pistons have damage from a screw...apparently the culprit was never found, but he either had partners or possibly bounced around from cylinder to cylinder: There is however no damage to liners. LGAFF 92 ZR1 #234 Last edited by LGAFF; 03-02-2018 at 07:46 AM.

10-19-2008	#22
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,191	Re: LT5 Assembly Project The only known other issue is the cross threaded bolt for the IH: LGAFF 91 ZR1 #234

10-19-2008	#25
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,132	Re: LT5 Assembly Project Yeah but LGAFF has NO Head Bolts.. that is the issue __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - 3" Magnaflow Bullet cats - LT4 Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

10-19-2008	#28
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,191	Re: LT5 Assembly Project It seems to me the tool is only needed to locate the proper hole, which I believe they state is at about 51 degress BTDC. The hole for cam timing is deeper that the others, and the pin tool drops flush in the proper notich. I would think that one could use a measured dowel to accomplish the same running a few rotations to ensure that you chose the correct notch. LGAFF 92 ZR1 #234

10-19-2008	#23
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,191	Re: LT5 Assembly Project Step one in inspecting the block, etc was the removal of the balancer. In order to hold the crank still, I placed a large head screwdriver in the crank position sensor hole, the crank has several notches in it, used for holding the crank still during cam timing. There is actually a tool that is inserted here that snaps into the notch and holds the crank still, but more to come on that. After locking the crank I removed the crank/balancer bolt. Crank position sensor hole: Then removed the balancer: LGAFF Last edited by LGAFF; 10-19-2008 at 08:24 PM.