Dipstick leak - The 1947 - Present Chevrolet & GMC Truck Message Board Network

blukangoo · 08-24-2007, 12:06 AM

Does anybody have any tricks to get the dipstick on an automatic transmission to stop leaking?
The first time I seen it dripping I thought it ran down the outside of the tube while filling it.
I have tried about 10 times to get the thing to stop leaking with different O-rings but it just won´t stop.
Everything is clean and straight.
It´s gettin on my nerves.

72armyswbtruck · 08-24-2007, 12:40 AM

Try another dip stick, sometimes they get worn down and will continue to leak no matter what.

krue · 08-24-2007, 12:50 AM

Some of the newer trannies don't used an o-ring, they have a rubber sleeve that fits over the end. I believe they have them in the HELP section at the parts stores. It may be worth trying.

blukangoo · 08-24-2007, 12:51 AM

The one I have in there right now is brand new. It was probably made in China or something.
I think I am going to put the old one in and try it.
Before I did the engine and tranny everything was full of oil so I don´t know if the old one was leaking.

blukangoo · 08-24-2007, 12:57 AM

Quote:

Originally Posted by krue

Some of the newer trannies don't used an o-ring, they have a rubber sleeve that fits over the end. I believe they have them in the HELP section at the parts stores. It may be worth trying.

That sounds better than just an O-Ring. I sure wish I was in the states, parts are easier to find over there. I´ll see if the store here has something like that. If he does he will have to order it just like almost everything else. The only stuff he has on stock are for tune-ups (Filters, plugs ...ect.)

I think I will just wrap teflon tape around it and hot glue it!

mtndewmaniac66 · 08-24-2007, 08:53 AM

A properly sized O-ring, (I.D. O.D. @thickness) will play a big difference. Also, CLEAN, no contamination. The other thing to check for is if the tube is out-of-round, they can get that way when pulled out for service.

70c10 · 08-24-2007, 12:36 PM

GM part numbers:
Transmission filler tube seal (top hat later style) - 1259475 (350 turbo)
Transmission filler tube seal (O-ring earlier style) - 6264902 (350 turbo)

blukangoo · 08-24-2007, 11:13 PM

I tried about 20 times yesterday and finally got the leak stopped. I finally found the right size o-ring and also put some teflon thread tape just under the lip above the o-ring.

The tube is brandnew and wasn´t deformed in any way. The spout was perfectly round.

Thanks for the tips anyways.

08-24-2007, 12:06 AM	#1
blukangoo Neighborhood Pickle Slinger Join Date: Jan 2007 Location: Cadolzburg, Bavaria, Germany Posts: 2,224	Dipstick leak Does anybody have any tricks to get the dipstick on an automatic transmission to stop leaking? The first time I seen it dripping I thought it ran down the outside of the tube while filling it. I have tried about 10 times to get the thing to stop leaking with different O-rings but it just won´t stop. Everything is clean and straight. It´s gettin on my nerves. __________________ -------------------------------------------------- My C10 Diary Our cars: 1966 Chevrolet Chevelle 396 - TH350 1968 Chevrolet C10/CST 327 TH400/375 1969 Corvette Stingray 350 - Muncie Manual Trans 1969 Chevrolet ElCamino 350 - TH400 1970 Cutlass Supreme Convertible - 350 Rocket - TH350 1973 Camaro LT - New Engine Done - TH350 1973 Corvette Convertible 454 - TH400

08-24-2007, 12:40 AM	#2
72armyswbtruck Registered User Join Date: Feb 2004 Location: Idaho Posts: 4,033	Re: Dipstick leak Try another dip stick, sometimes they get worn down and will continue to leak no matter what. __________________ "Remember, They can Kill You, but they can't eat You, That's against the law!!!!!!!!!"

08-24-2007, 12:50 AM	#3
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Re: Dipstick leak Some of the newer trannies don't used an o-ring, they have a rubber sleeve that fits over the end. I believe they have them in the HELP section at the parts stores. It may be worth trying. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

08-24-2007, 12:51 AM	#4
blukangoo Neighborhood Pickle Slinger Join Date: Jan 2007 Location: Cadolzburg, Bavaria, Germany Posts: 2,224	Re: Dipstick leak The one I have in there right now is brand new. It was probably made in China or something. I think I am going to put the old one in and try it. Before I did the engine and tranny everything was full of oil so I don´t know if the old one was leaking. __________________ -------------------------------------------------- My C10 Diary Our cars: 1966 Chevrolet Chevelle 396 - TH350 1968 Chevrolet C10/CST 327 TH400/375 1969 Corvette Stingray 350 - Muncie Manual Trans 1969 Chevrolet ElCamino 350 - TH400 1970 Cutlass Supreme Convertible - 350 Rocket - TH350 1973 Camaro LT - New Engine Done - TH350 1973 Corvette Convertible 454 - TH400

08-24-2007, 08:53 AM	#6
mtndewmaniac66 Do the Dew! Join Date: May 2005 Location: Vernal, Utah Posts: 191	Re: Dipstick leak A properly sized O-ring, (I.D. O.D. @thickness) will play a big difference. Also, CLEAN, no contamination. The other thing to check for is if the tube is out-of-round, they can get that way when pulled out for service.

08-24-2007, 12:36 PM	#7
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Re: Dipstick leak GM part numbers: Transmission filler tube seal (top hat later style) - 1259475 (350 turbo) Transmission filler tube seal (O-ring earlier style) - 6264902 (350 turbo) __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

08-24-2007, 11:13 PM	#8
blukangoo Neighborhood Pickle Slinger Join Date: Jan 2007 Location: Cadolzburg, Bavaria, Germany Posts: 2,224	Re: Dipstick leak I tried about 20 times yesterday and finally got the leak stopped. I finally found the right size o-ring and also put some teflon thread tape just under the lip above the o-ring. The tube is brandnew and wasn´t deformed in any way. The spout was perfectly round. Thanks for the tips anyways. __________________ -------------------------------------------------- My C10 Diary Our cars: 1966 Chevrolet Chevelle 396 - TH350 1968 Chevrolet C10/CST 327 TH400/375 1969 Corvette Stingray 350 - Muncie Manual Trans 1969 Chevrolet ElCamino 350 - TH400 1970 Cutlass Supreme Convertible - 350 Rocket - TH350 1973 Camaro LT - New Engine Done - TH350 1973 Corvette Convertible 454 - TH400 Last edited by blukangoo; 08-24-2007 at 11:14 PM. Reason: It´s so fun to edit

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