Leaking Rear Main Seal!! - Pirate4x4.Com : 4x4 and Off-Road Forum

caswellfamily · 08-27-2001, 09:55 PM

My Stock 1970 Landcruiser with a "F" engine has a leaky rear main seal. Is there a simple way to replace it. Ie without removing the pan, crank shaft and Tranny? HELP!!!!

Thanks in advance,

Mark Caswell <IMG SRC="smilies/bounce2.gif" border="0">

Pin Head · 08-27-2001, 10:18 PM

You need to remove the tranny and flywheel to change the rear main seal, but not drop the oil pan. First make sure that it is not leaking from the oil pan seal. Mine was leaking at the rear oil pan gasket and just tightening the bolts little stopped most of the leak. The freeze plugs for the oil gallery (behind the flywheel) can also leak. It is usually best to wait until you need to drop the tranny to fool with the rearm main seal.

caswellfamily · 08-27-2001, 10:20 PM

Thanks Pin Head, your always a great help!!

Mark

cruiserman · 08-28-2001, 09:17 AM

Don't forget to do the clutch at the same time. Look for oil on the clutch itself for main seal leak evidence.

Sloan · 08-28-2001, 03:17 PM

Definitely check the rear of the gasket on the oil pan. When you replace that sucker get the Toyota gasket because the aftermarket ones don't seat as well and will eventually leak. Also when you have the pan removed if you are not replacing it make sure and take the time to lay it on the ground and get the edges that seat on the block as flattened out as possible to get the best seal. <IMG SRC="smilies/biggrin.gif" border="0"> The best way to replace the rear main seal without pulling the tranny is to just pull the engine and voila no hassle with removing the tranny.
<IMG SRC="smilies/biggrin.gif" border="0">

[ 08-28-2001: Message edited by: Sloan ]

caswellfamily · 08-28-2001, 08:53 PM

Thank you all for all your help. It was what I figured but didn't want to accept. I changed out a rear main seal on a 1989 Jeep 4.0 L. buy just droping the pan but I figured this would be a lot more difficult.

Again,

Thanks!!

Mark Caswell

Sloan · 08-28-2001, 08:59 PM

There is a kid in Ojai named Jessie that has a small 4x shop try and track him down. He drives a Toyota truck and runs with a good sized group of wheelers up there. He shouldn't be too hard to track down. I had him do my clutch a couple of years ago, nice price and no worries. I know that's pretty vague but that's all I got. <IMG SRC="smilies/biggrin.gif" border="0">

Pin Head · 08-28-2001, 09:53 PM

Actually, dropping the tranny is a push when it comes to labor and difficulty compared to removing and replacing the oil pan and rear main cap. The tranny comes out pretty easy with a tranny jack.

08-27-2001, 09:55 PM	#1 (permalink)
caswellfamily Registered User Join Date: Aug 2001 Member # 6752 Location: Santa Barbara, CA, USA Posts: 3	Leaking Rear Main Seal!! My Stock 1970 Landcruiser with a "F" engine has a leaky rear main seal. Is there a simple way to replace it. Ie without removing the pan, crank shaft and Tranny? HELP!!!! Thanks in advance, Mark Caswell <IMG SRC="smilies/bounce2.gif" border="0">

08-28-2001, 09:17 AM	#4 (permalink)
cruiserman Registered User Join Date: Aug 2000 Member # 1527 Location: Idaho Posts: 1,034	Don't forget to do the clutch at the same time. Look for oil on the clutch itself for main seal leak evidence. __________________ 80, '72 GMC, Odyssey

08-28-2001, 03:17 PM	#5 (permalink)
Sloan Registered User Join Date: Feb 2000 Member # 171 Location: Southern Kalifornie, home of the homeless Posts: 6,080	Definitely check the rear of the gasket on the oil pan. When you replace that sucker get the Toyota gasket because the aftermarket ones don't seat as well and will eventually leak. Also when you have the pan removed if you are not replacing it make sure and take the time to lay it on the ground and get the edges that seat on the block as flattened out as possible to get the best seal. <IMG SRC="smilies/biggrin.gif" border="0"> The best way to replace the rear main seal without pulling the tranny is to just pull the engine and voila no hassle with removing the tranny. <IMG SRC="smilies/biggrin.gif" border="0"> [ 08-28-2001: Message edited by: Sloan ] __________________ "Fawk no it isn't safe, we're at 18,000' on K2 in a blizzard!" Bill Pierson

08-28-2001, 08:59 PM	#7 (permalink)
Sloan Registered User Join Date: Feb 2000 Member # 171 Location: Southern Kalifornie, home of the homeless Posts: 6,080	There is a kid in Ojai named Jessie that has a small 4x shop try and track him down. He drives a Toyota truck and runs with a good sized group of wheelers up there. He shouldn't be too hard to track down. I had him do my clutch a couple of years ago, nice price and no worries. I know that's pretty vague but that's all I got. <IMG SRC="smilies/biggrin.gif" border="0"> __________________ "Fawk no it isn't safe, we're at 18,000' on K2 in a blizzard!" Bill Pierson

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08-27-2001, 10:18 PM	#2 (permalink)
Pin Head Registered User Join Date: May 2001 Member # 4783 Location: Orange Co. CA Posts: 1,797	You need to remove the tranny and flywheel to change the rear main seal, but not drop the oil pan. First make sure that it is not leaking from the oil pan seal. Mine was leaking at the rear oil pan gasket and just tightening the bolts little stopped most of the leak. The freeze plugs for the oil gallery (behind the flywheel) can also leak. It is usually best to wait until you need to drop the tranny to fool with the rearm main seal.

08-27-2001, 10:20 PM	#3 (permalink)
caswellfamily Registered User Join Date: Aug 2001 Member # 6752 Location: Santa Barbara, CA, USA Posts: 3	Thanks Pin Head, your always a great help!! Mark

08-28-2001, 08:53 PM	#6 (permalink)
caswellfamily Registered User Join Date: Aug 2001 Member # 6752 Location: Santa Barbara, CA, USA Posts: 3	Thank you all for all your help. It was what I figured but didn't want to accept. I changed out a rear main seal on a 1989 Jeep 4.0 L. buy just droping the pan but I figured this would be a lot more difficult. Again, Thanks!! Mark Caswell

08-28-2001, 09:53 PM	#8 (permalink)
Pin Head Registered User Join Date: May 2001 Member # 4783 Location: Orange Co. CA Posts: 1,797	Actually, dropping the tranny is a push when it comes to labor and difficulty compared to removing and replacing the oil pan and rear main cap. The tranny comes out pretty easy with a tranny jack.