L31 crank position sensor hole on new long block - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jim_PA · 04-09-2010, 12:29 PM

On the bottom of the timing cover is what I believe to be the crank position sensor... Can this hole just be plugged if the engine is being used without a computer?

This is on a brand new L31 long block being used with a carb and TH350 --

faribran · 04-09-2010, 12:42 PM

Yes sir, we purchased a small plug (freezer plug)from the NAPA store... put silicone sealant around it and tapped it into place... works like a champ.

Jim_PA · 04-09-2010, 01:00 PM

Quote:

Originally Posted by faribran

Yes sir, we purchased a small plug (freezer plug)from the NAPA store... put silicone sealant around it and tapped it into place... works like a champ.

A freezer plug? What did you ask them for at NAPA?

From your description, it sounds like this isn't a threaded pipe fitting, but a smooth thing you just need to press into the hole? I just know the hole exists, I don't have the engine in front of me to look

Thanks

SSC's76 · 04-10-2010, 10:46 AM

Quote:

Originally Posted by Jim_PA

A freezer plug? What did you ask them for at NAPA?

From your description, it sounds like this isn't a threaded pipe fitting, but a smooth thing you just need to press into the hole? I just know the hole exists, I don't have the engine in front of me to look

Thanks

Yeah just a small freeze plug works fine. I used a small freeze plug when I did the engine in the truck and used some plastic weld epoxy to make sure it stayed. In the birdy when I had the vortec 305 in it I just left the old CPS in. I just for the life of me cant remember what size the plug is.

Jim_PA · 04-10-2010, 12:41 PM

Thanks-- I think it's 3/4" Should be a sealed power # SEP3819013 from napa

faribran · 04-12-2010, 09:14 AM

just so you know.... if u look on the back of the cover there are part numbers for 2 covers... 1 with the hole, 1 with out the hole...tis my understanding both are available from GM...

**Captainfab** · 04-13-2010, 12:03 AM

The non-sensor hole composite cover is available online for $50.00. I would opt for either a steel cover or the freeze plug fix for the sensor hole.

Quote:

Originally Posted by faribran

just so you know.... if u look on the back of the cover there are part numbers for 2 covers... 1 with the hole, 1 with out the hole...tis my understanding both are available from GM...

04-09-2010, 12:29 PM	#1
Jim_PA Registered User Join Date: May 2005 Location: PA Posts: 2,696	L31 crank position sensor hole on new long block On the bottom of the timing cover is what I believe to be the crank position sensor... Can this hole just be plugged if the engine is being used without a computer? This is on a brand new L31 long block being used with a carb and TH350 --

04-09-2010, 12:42 PM	#2
faribran Registered User Join Date: Jul 2005 Location: AL Posts: 1,828	Re: L31 crank position sensor hole on new long block Yes sir, we purchased a small plug (freezer plug)from the NAPA store... put silicone sealant around it and tapped it into place... works like a champ. __________________ "

04-10-2010, 12:41 PM	#5
Jim_PA Registered User Join Date: May 2005 Location: PA Posts: 2,696	Re: L31 crank position sensor hole on new long block Thanks-- I think it's 3/4" Should be a sealed power # SEP3819013 from napa

04-12-2010, 09:14 AM	#6
faribran Registered User Join Date: Jul 2005 Location: AL Posts: 1,828	Re: L31 crank position sensor hole on new long block just so you know.... if u look on the back of the cover there are part numbers for 2 covers... 1 with the hole, 1 with out the hole...tis my understanding both are available from GM... __________________ "



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.