Chevy 307 oil leak (fuel pump area)
10-17-2009, 05:41 PM
#1
Chevy 307 oil leak (fuel pump area) I got oil dripping down, thought maybe i could ask some of you where i could be expecting the leak to be from before i cleaned everything off and checked again.
Is there a common place for it to leak from down there? Heres a few pictures i took today. BTW its oil not gas.
Is there a common place for it to leak from down there? Heres a few pictures i took today. BTW its oil not gas.
Last edited by LT1; 12-22-2009 at 12:20 AM.
10-17-2009, 05:54 PM
#2
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Yes it can leak there, it looks like it's been dripping for some time.
I would check your front intake seal too, they can leak and run down the face of the motor.
I would check your front intake seal too, they can leak and run down the face of the motor.
10-17-2009, 09:51 PM
#4
there is a gasket that sits between your fuel pump and block. Your fuel pump is held on by two bolts, remove the lines, clean the mating surfaces, and install a new gasket, 2bucks from autozone. Should take care of your problem, if that is indeed wher e the leak is from.
10-17-2009, 11:54 PM
#5
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On the small block Chevy there are two bolt holes on the face (front) of the block in the area just to the right of the fuel pump boss arranged vertically. One of the bolt holes is not blind and goes right into the valley where the fuel pump pushrod resides. If there is no bolt in that hole (with sealer on the threads), it will leak oil from there. I can't remember if it's the top hole or the bottom, but it's something to check. A lot of people, including myself, forget that little gem.
10-18-2009, 08:02 PM
#7
So i finally got to replacing the gaskets and cleaning everything up. I found out that its leaking from front oil pan gasket area. Anyone ever replace oil pan gasket on a first gen fbody? Im not looking forward to doing it lol. Should i get a new oil pan i heard chrome oil pan's always have oil leaks. any info on this would help.
heres a picture of it all cleaned up.
heres a picture of it all cleaned up.
Last edited by LT1; 12-22-2009 at 12:23 AM.
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10-20-2009, 06:25 AM
#10
On the small block Chevy there are two bolt holes on the face (front) of the block in the area just to the right of the fuel pump boss arranged vertically. One of the bolt holes is not blind and goes right into the valley where the fuel pump pushrod resides. If there is no bolt in that hole (with sealer on the threads), it will leak oil from there. I can't remember if it's the top hole or the bottom, but it's something to check. A lot of people, including myself, forget that little gem.
It's the top one. Don't use to long of a bolt, 1/2" or shorter or you will jam it against the fuel pump push rod and wipe out the cam lobe. And it will be horizontal, vertical is up and down. But great catch.
10-20-2009, 02:07 PM
#11
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Hey, I was close! Lol! I haven't worked on a small block in years, just LS stuff. Actually, the last engine I built from the ground up was a small block Ford! Anyway, I know there are those bolt holes and the one will **** oil all over if you don't close it up, I just couldn't remember (obviously) the orientation or which one was open. Thanks for the correction!
10-21-2009, 12:35 AM
#12
Well in the processes of replacing the oil pan gasket with a 1 piece rubber steel core. I hope it will stop the leaks, might have to check the straightness of the pan too. I also found a small coolant leak on the radiator tank, how much is it to replace the tanks? Appears to be the original radiator.
Yeah had the 307 when i bought it. I kind of like the mpg it gives its not too bad for a V8. i drive it quiet a bit, why i been keeping it. Was planning to get a Pontiac 400/455 someday. If i come across one hard finding them around here.
Yeah had the 307 when i bought it. I kind of like the mpg it gives its not too bad for a V8. i drive it quiet a bit, why i been keeping it. Was planning to get a Pontiac 400/455 someday. If i come across one hard finding them around here.
10-21-2009, 06:23 AM
#13
Well in the processes of replacing the oil pan gasket with a 1 piece rubber steel core. I hope it will stop the leaks, might have to check the straightness of the pan too. I also found a small coolant leak on the radiator tank, how much is it to replace the tanks? Appears to be the original radiator.
Yeah had the 307 when i bought it. I kind of like the mpg it gives its not too bad for a V8. i drive it quiet a bit, why i been keeping it. Was planning to get a Pontiac 400/455 someday. If i come across one hard finding them around here.
Yeah had the 307 when i bought it. I kind of like the mpg it gives its not too bad for a V8. i drive it quiet a bit, why i been keeping it. Was planning to get a Pontiac 400/455 someday. If i come across one hard finding them around here.
Is it the palstic/aluminum radiator? My mom had hers done in her Exploder last week and cost around $250. that was driving it to the rad shop and dropping it off.
I just sold my extra 455 a couple of months ago. Have an extra th400 for a BOP. You can get 400's out of 76-77 Grand Prix's pretty easy. Then take a 400 block bore it .030 and a 455 crank and turn the mains down to 3" and build a 455 from a 400. Nobody will know whaat's inside as the external deminsions of most Pontiacs are the same.
Start here on your Pontiac build http://www.ohiocrank.com/pont_rotate.html
OH yea, if you build it right, you can get very good mpg. I had a 77 Bird with a 455 and got 26 on the highway. Thanks to the right Crane Cam and 2.41 gears.
10-23-2009, 04:36 AM
#14
The radiator looks aluminum, ill take a picture of it later today (just been busy).
Thanks for the link ill check it out. That's awesome about your 77 Firebird getting those mpg numbers. I think the rear gear choice had a lot to do with it. Id love to have a big cube Pontiac setup eventually.
Im still waiting for the pan gasket that i orderd from summit should come in today i think.
Link to the gasket i bought. Let me know thoughts on this gasket if its any good.
http://www.summitracing.com/parts/MIL-41000/
Thanks for the link ill check it out. That's awesome about your 77 Firebird getting those mpg numbers. I think the rear gear choice had a lot to do with it. Id love to have a big cube Pontiac setup eventually.
Im still waiting for the pan gasket that i orderd from summit should come in today i think.
Link to the gasket i bought. Let me know thoughts on this gasket if its any good.
http://www.summitracing.com/parts/MIL-41000/
Last edited by LT1; 10-23-2009 at 04:42 AM.
11-17-2009, 12:49 AM
#16
Great! found out its not the pan gasket lol
It was leaking from back of the power steering pump running down the swaybar making it look like its leaking from a different location. i got that leak fixed and now i see another leak from the gear box.
So looks like im going to pull the gear box and go from there. Does anyone know what seal to replace and whats involved, it looks like its leaking from the top of the gear box where the adjuster nut and valve assembly, stub shaft.
It was leaking from back of the power steering pump running down the swaybar making it look like its leaking from a different location. i got that leak fixed and now i see another leak from the gear box.
So looks like im going to pull the gear box and go from there. Does anyone know what seal to replace and whats involved, it looks like its leaking from the top of the gear box where the adjuster nut and valve assembly, stub shaft.
12-04-2009, 03:37 AM
#18
In the mean time out of all things found out my intake manifold was cracked and leaking coolant now im about to buy a new intake manifold.
Could you tell me which one to get, i dont understand what the difference in performance if any. Id like to go with one of them, i have a Quadrajet carb. Would i be able to run Holley carb if i went with #7104 ?
Edelbrock Performer RPM #7104 (for quadrajet)
Edelbrock Performer RPM #7101
Edelbrock Performer RPM Air-Gap #7501
Last edited by LT1; 12-22-2009 at 12:25 AM.
12-09-2009, 06:39 PM
#20
I finally got the RPM Air-Gap, only problem is i have a Q-jet carb, do i need some sort of adapter to make it fit? If so what part number? I posted a pic on the other thread but ill post it again here.
Last edited by LT1; 12-22-2009 at 12:29 AM.