WS6_MAC

iTrader: (6)

Hi Experts,

Upon tracing an oil leak on my LS1, I found that the cam position sensor had a build up of oil sitting in the valley between the top of the block and the rear cover. I have been trying to find an o-ring replacement for the sensor without any luck. Has anyone purchased new o-rings for the cam or crank position sensors?

Mac

Tainted

iTrader: (9)

Have you looked at lowes or a hardware store? Sometimes you can get lucky and find what you need

WS6_MAC

iTrader: (6)

I have not looked at the local HW stores as the seals need to be gas and oil rated plus be of exact size. Has anyone used generic o-rings with success?

RezinTexas

both of them are dash number 113. any parts store will have them. they do not need to be fuel rated.

I'm running replacements from oreilly auto parts on my new stroker engine.

WS6_MAC

iTrader: (6)

Excellent info - Thanks!

idakiteman

They are NOT "dash number 113" in size. You'll be able to tell from the fit that a DASH 113 is way too loose and will cause leaks like sand through an hourglass. .GM doesn't have a part # for a replacement o-ring. Check on eBay. and you'll find someone that sells correct o-rings

non-sponsor link deleted - V8r

G Atsma

You're responding to an 8 year old thread

Sacrilege

iTrader: (1)

Some solid thread necromancy right there. A little heads up - you can find o-rings at pretty much any hardware store or auto parts store.

cdk4219

Does gm carry these orings now? I have been chasing a rear leak and suspect it is the crappy aftermarket oring that the jasper engine I have is the culprit. I did the rear main with a felpro from Napa, but really didn’t like the way the seal was easily pressed into the cover with my fingers. The rear cover gasket I took off was an aluminum with black gasket material that was all cracked and fell off the aluminum easily. Looks like the Napa felpro I replaced it with.

Is it really a 113 ring or is it metric. I definitely would like to get solved, as it is my 2011 dodge 3500 4x4 work truck with a 2006 lq4 4l80e.

cdk4219

Anyone have the part number?

CattleAc

iTrader: (7)

Not trying to derail anyone's thread, but, do you have any pictures of this swap...???

cdk4219

Sure, looks like a lifted dodge 3500 4x4 dual wheel with a Chevy e fine, but I will snap some pictures tomorrow..

Darth_V8r

iTrader: (4)

Thread moderated. non-sponsor link deleted.

cdk4219

Alright after replacing the cam sensor o ring on 2 leaking 6 liter engines, I am baffled as to how the cam sensor would leak? It isnt under pressure, it seems like the only thing that could possibly leak in that valley is the rear cover gasket that seals the pressurized oil galley by the cam sensor. With the cam sensor removed, and the engine running, no oil comes out of the sensor hole. Is there something I’m missing, or is it really the back cover gasket which I have replaced with a Napa rear seal felpro kit?

I have 2 of these leaking exactly the same way, and the flex plates are dry and oil is coming down from the top of the rear cover on each side and exiting at the starter bolt and oil pan bolt on each side. When pulling the cam sensor after running it is wet 1/2” above the o-ring indicating that the valley in the block is filling up and spilling out each side of the cover. How are people thinking the cam sensor can cause a leak?

G Atsma

Oil pressure sender is right next to the Gen III cam sensor.
They can leak A BUNCH!

cdk4219

I can’t see the oil pressure sensor leaking inside the rear cover and filling the cam sensor valley, If it’s leaking it would definitely run down the side of the trans. When I pull the cam sensor and run the engine there is no leak, so how possibly does the cam sensor leak oil? The only way I can see this happening is if the crankcase is under positive pressure? It must be the rear cover gasket in the oil galley leaking or porosity in something back there.

2003vette

I can verify that I used a dash 113 to replace the oring and it just leaked slower than before, but still leaked.

I have a whole new sensor being shipped.

what I don’t understand is people say this oring shouldn’t be under pressure and the oil is just splashing around up there. How is it blowing out so heavily then? My PCV isn’t clogged and my oil pressure is normal.

before you say it…. No the OPS is not the source.

5.7stroker

iTrader: (36)

If it's not 113, then what is the correct part number for just the O-ring itself that won't leak?

2003vette

Damned if I know, but with a very keen eye you can see that the 113 is thinner. If $40 bucks isn't gonna break you, r0ck@uto has NTK/NGK sensor for about $37.

5.7stroker

iTrader: (36)

Well this thread as old as it is saved me a potential future leak. I pulled up some part info on here awhile back showing 113 and was about to use these lol.