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#1 |
Account Suspended
Join Date: Jan 2009
Location: Kuna, Idaho
Posts: 1,046
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454 Leaking lots of oil ?'s
Got a 454 in my '69 c10. Put the truck on my cement working pad last night. Went out there this morning to notice a puddle of oil under the truck and a flat tire. Looked under there and it seems to be leaking from the rear main seal. That's where the oil is coming from so that's what I'm assuming.
How do I go about fixing that without pulling the motor? I know I have to drain the oil and pull the pan, but what else do I have to do fix it? Step by step instructions would help greatly. Thanks guys and Merry Christmas. |
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#2 |
Junior Member
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
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Re: 454 Leaking lots of oil ?'s
I have never done it, but my son says you have to pull the motor. Hopefully some one else will chime in that has done it in the truck.
Also check and make sure the oil pressure line just above the oil filter is not leaking.
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'67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E. |
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#3 |
Account Suspended
Join Date: Jan 2009
Location: Kuna, Idaho
Posts: 1,046
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Re: 454 Leaking lots of oil ?'s
I sure hope I don't have to pull the engine out. But I sure do hope someone else can chime in.
Thanks for your input. |
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#4 |
What?
Join Date: Jun 2007
Location: Southern California
Posts: 7,617
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Re: 454 Leaking lots of oil ?'s
If it were me.
I would make sure that the leak was coming from the rear main seal before anything. I have seen distributors missing a gasket, and oil then leaks down the back of the engine. Also the rear of the intake manifold, or a valve cover gasket can cause oil to run down the back of the engine. Could also be a leaking oil pressure gauge line. As for doing a rear main seal? Personally if I had to do it, I would pull the motor and re seal the whole thing to do the job right.
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Chris 1968 K20 Suburban 1972 K10 LWB PU |
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#5 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: 454 Leaking lots of oil ?'s
also chech the oil filter
do you have a PCV system imstalled if not a build up of pressure could cause the valve covers or oil pan gassket to blow out and leak oil
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#6 |
"brand new second-hand"
Join Date: Feb 2007
Location: White House, Tennessee
Posts: 526
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Re: 454 Leaking lots of oil ?'s
Well, I had the same problem so here goes! I was leaking so much oil that I thought the EPA was coming for me
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Steve 69 3/4t custom camper tilt,am/fm,speed warning,air gauge,buddy buckets,aux battery, big block,p/s,p/b,a/c 67 Camaro 96 Impala ss-sold 04 hybrid Honda-saving gas for the blue truck!:b69: |
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#7 |
Account Suspended
Join Date: Jan 2009
Location: Kuna, Idaho
Posts: 1,046
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Re: 454 Leaking lots of oil ?'s
Awesome. Thanks for all the replies guys.
Vectorit and Cdowns - I will defiantly check all the out before I dive into anything. I'd hate to spend all my money on trying to find the problem and not have any money for gas to test what I fixed. Thankfully I have another one I can drive in the mean time while I'm fixing this one. Since I have the other truck, I'm just going to pull this motor to see exactly where the wet spot starts, then go from there. Into69z - Thanks for all the information. I'm just going to pull the engine out. Like you said it was a B^%ch to get that pan off. My truck as well came with a 350 in it so I don't have the high hump. Beings I don't have a shop to work in and our high is in the 30's for weather, it would be faster and easier to pull it instead. Tomorrow during the day I will defiantly check out that plug and see if it's coming from there. I don't think it is because the front half of the oil pan is dry. It's dripping onto the flywheel from the crank area, but like the others said, it could be coming from higher up. The 454 I have is out of a 1973 and is bone stock other than the carburetor and fan, so it doesn't really surprise me that it's just now starting to leak from anywhere. But I will defiantly let you guys know what I find out about where the leak is coming from. If I have anymore questions or concerns about anything, I'll just keep this thread and ask on here instead of making a new one each time. Really appreciate the help guys. Thanks again. |
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#8 |
Account Suspended
Join Date: Dec 2011
Location: ma
Posts: 278
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Re: 454 Leaking lots of oil ?'s
box stock 73 454 with I'll guess a rope rear seal.. by chance are use use'n syn oil..
syn oil or syn blend oil will leak right past 40 y/o seals, hell sometimes they leak in new builds that use the "date correct type gaskets) just something to think about, before you go pulling it.. |
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#9 |
Active Member
Join Date: Oct 2006
Location: Ohio
Posts: 1,643
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Re: 454 Leaking lots of oil ?'s
I like your idea of pulling it.
I have changed my a couple of times with the motor still in the truck. With my old Milodon pan I did not have to jack up the motor - my Moroso pan is a different story. I take out the transmission bolts on the crossmemeber and the tranny mount - pull the bolts on the engine mounts and jack up the motor as high as I can. Once you drop the pan you may have to rotate the crank to get the front counter weight up into the block - this will let the pan pull out. I like the one piece oil pan gaskets - Mr Gasket brand is a favorote over the fel pro but I would use both. The rear main seal is pretty stright forward - pull the rear main cap - this half of the seal you can pull out by hand - the seal in the block can be a bear - espcially if it is old. Use care since you do not want to scratch the crank or seal area It may help to use the lower old seal to push out the old uppper seal I always put a small amount of assembly lube onto the seal lip so it is not dry at start up. When I install the seals I also set them up so instead of the seal split being at 9 and 3 oclock I shoot for 8 and 2 olclock - that makes the split lines fall inside the block and inside your rear main cap. Helps keep them from leaking. torque down your rear main cap and clean everything and reassemble.
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1968 SWB 454 + .040, 490HP x 540 FT pounds of Torque 10-1 Kb Forged pistons, recon rods w/ ARP wave loc bolts 781 heads Ported with 2.19/1.88 SSTvalves Lunati 60204 cam, Micro Trol lifters, Ported Edelbrock Performer Rpm manifold armor coated, Pertronix Triple Strike Ignition Holley 770 Street Avenger carb,Headers armor coated Built by Watson Ruppel Performance in Sarahsville Ohio. Hardshift Tranny Built Turbo 350,TSI 10" 3000 stall 12 Bolt Eaton Posi 4.10 Richmond Gears moser axles ![]() 18.5" x 31" Hoosier Pro Street Radials ![]() ET Classic 5 Wheels - polished Power Steering, Power Brakes,Disc Brakes,Tach & Gauge Dash, Tilt,Factory Air (gone) Custom Paint & Body Work Special thanks to my wife, my son and my money tree ![]() |
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