Blowing oil out of trans?

Robert Simpson · 01-30-2012, 01:21 PM

A friend of mine has a SBC stocker and recently experienced a problem. He made several passes with no problems. But on his last pass once he crossed the finish line and got out of it it started pooring smoke out. He saw it, cut it off and coasted off the track. When I got to him he showed me where the dip stick was pushed out and trans oil was everywhere!. It is a T200 with a breather tube on the firewall and a locking dipstick. He just loaded it up and went home. The trans seamed to work ok after that. What could cause this? The trans is not brand new but not wore out. Any ideas? Thanks

SSGN · 01-30-2012, 01:27 PM

Does the breather tube go to a catch can?? All of my 200r4 do this when hot,so I built a nice catch can with a drain ****

Kevin

gsa612 · 01-30-2012, 01:52 PM

I run a m200 in my stocker, heard of that happening. Seeing it never did it before I would pull the pan and have a look. You say it pushed out the locking dipstick, did you just install it. The orig. one has a v in the upper seal which helps in venting. gsa612

Alan Roehrich · 01-30-2012, 01:59 PM

Does he know what his transmission fluid temperature is?

If it pushed a locking dip stick out of the tube, the vent system is stopped up somewhere.

In any event, that much pressure is a sure sign of a fair amount of heat.

Jim Wahl · 01-30-2012, 02:06 PM

Quote:

Originally Posted by Alan Roehrich

Does he know what his transmission fluid temperature is?

If it pushed a locking dip stick out of the tube, the vent system is stopped up somewhere.

In any event, that much pressure is a sure sign of a fair amount of heat.

You beat me to it Alan! Younger brain and fingers! Jim

.

Jim Kaekel · 01-30-2012, 04:41 PM

X2 on what Alan said. High fluid temps, over full condition, plugged vent or an internal hydraulic oil pressure leak can cause this as well. It's best to fill race transmissions to the 1 pint below full mark if the dipstick is labeled as such. Hope this helps, just my .02.

Dave Ribeiro · 01-30-2012, 05:30 PM

I still agree with having an over -flow bottle for M-200 ... Also agree
with running it a pt. low to start ...Check the dipstick & tube for cracks. Agree with Alan on fluid temp ? Make sure you check level after a few passes , if its low for a while it will start to flash higher in the 1-2 & 2-3 shifts .... Good Luck ,

Neil Smedley · 01-30-2012, 07:09 PM

If you used an aftermarket chrome dipstick tube with your original dipstick............the tube is 1 1/4 inches too long....your trans could be overfull by a little over 2 quarts.............

ss3011 · 01-30-2012, 07:38 PM

I always check the calibration of dipstick, If you have a production pan the full hot mark should be right at the pan gasket. Full hot is measured at 200 degF. transmission temperature. If you overfill the trans the oil will get up into the rotating parts and whip up like a milkshake. The venting system cannot handle that volume of frothed up oil and will spit it out. Also, sometimes the pump halves are not flat, and high pressure oil will cross leak inside the pump. This could cause oil out the vent. The pump halves need to be flat, and torqued to factory specs.

bob3240 · 01-30-2012, 08:37 PM

one possibility toois that after several passes the fluid got hot enough to boil and spew out. aithappened on a tow truck once (and had a little fire).

01-30-2012, 01:21 PM	#1
Robert Simpson Senior Member Join Date: Aug 2004 Location: Jacksonville, Florida Posts: 808 Likes: 7 Liked 20 Times in 12 Posts	Blowing oil out of trans? A friend of mine has a SBC stocker and recently experienced a problem. He made several passes with no problems. But on his last pass once he crossed the finish line and got out of it it started pooring smoke out. He saw it, cut it off and coasted off the track. When I got to him he showed me where the dip stick was pushed out and trans oil was everywhere!. It is a T200 with a breather tube on the firewall and a locking dipstick. He just loaded it up and went home. The trans seamed to work ok after that. What could cause this? The trans is not brand new but not wore out. Any ideas? Thanks

01-30-2012, 01:27 PM	#2
SSGN Senior Member Join Date: Feb 2006 Posts: 646 Likes: 132 Liked 140 Times in 51 Posts	Re: Blowing oil out of trans? Does the breather tube go to a catch can?? All of my 200r4 do this when hot,so I built a nice catch can with a drain **** Kevin

01-30-2012, 01:52 PM	#3
gsa612 Senior Member Join Date: Jan 2008 Location: 100th Meridian Posts: 569 Likes: 116 Liked 280 Times in 139 Posts	Re: Blowing oil out of trans? I run a m200 in my stocker, heard of that happening. Seeing it never did it before I would pull the pan and have a look. You say it pushed out the locking dipstick, did you just install it. The orig. one has a v in the upper seal which helps in venting. gsa612

01-30-2012, 01:59 PM	#4
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,118 Likes: 1,573 Liked 1,837 Times in 417 Posts	Re: Blowing oil out of trans? Does he know what his transmission fluid temperature is? If it pushed a locking dip stick out of the tube, the vent system is stopped up somewhere. In any event, that much pressure is a sure sign of a fair amount of heat. __________________ Alan Roehrich 212A G/S

01-30-2012, 04:41 PM	#6
Jim Kaekel VIP Member Join Date: Jul 2002 Location: Michigan Posts: 1,229 Likes: 133 Liked 535 Times in 110 Posts	Re: Blowing oil out of trans? X2 on what Alan said. High fluid temps, over full condition, plugged vent or an internal hydraulic oil pressure leak can cause this as well. It's best to fill race transmissions to the 1 pint below full mark if the dipstick is labeled as such. Hope this helps, just my .02. __________________ Jim Kaekel 3836 STK

01-30-2012, 05:30 PM	#7
Dave Ribeiro VIP Member Join Date: Sep 2002 Location: Williamsburg, Va.---USA Posts: 1,827 Likes: 1,612 Liked 56 Times in 27 Posts	Re: Blowing oil out of trans? I still agree with having an over -flow bottle for M-200 ... Also agree with running it a pt. low to start ...Check the dipstick & tube for cracks. Agree with Alan on fluid temp ? Make sure you check level after a few passes , if its low for a while it will start to flash higher in the 1-2 & 2-3 shifts .... Good Luck , __________________ Dave Ribeiro 1033 STK

01-30-2012, 07:09 PM	#8
Neil Smedley Member Join Date: Feb 2002 Location: Phoenix, AZ Posts: 163 Likes: 32 Liked 22 Times in 7 Posts	Re: Blowing oil out of trans? If you used an aftermarket chrome dipstick tube with your original dipstick............the tube is 1 1/4 inches too long....your trans could be overfull by a little over 2 quarts.............

01-30-2012, 07:38 PM	#9
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 909 Likes: 70 Liked 239 Times in 114 Posts	Re: Blowing oil out of trans? I always check the calibration of dipstick, If you have a production pan the full hot mark should be right at the pan gasket. Full hot is measured at 200 degF. transmission temperature. If you overfill the trans the oil will get up into the rotating parts and whip up like a milkshake. The venting system cannot handle that volume of frothed up oil and will spit it out. Also, sometimes the pump halves are not flat, and high pressure oil will cross leak inside the pump. This could cause oil out the vent. The pump halves need to be flat, and torqued to factory specs. Last edited by ss3011; 01-30-2012 at 07:41 PM. Reason: mis-spelled

01-30-2012, 08:37 PM	#10
bob3240 Member Join Date: Jan 2009 Location: lebanon ohio Posts: 251 Likes: 3 Liked 16 Times in 5 Posts	Re: Blowing oil out of trans? one possibility toois that after several passes the fluid got hot enough to boil and spew out. aithappened on a tow truck once (and had a little fire).