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Old 02-29-2020, 06:46 PM   #1
sawbuck
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Default flathead fuel pump push rod

first startup of my rebuilt 8ba ...i had to gravity feed the fuel...the push rod does not move up at all.its as though the lobe is not on the cam...brand new isky 77b....can the cam bearing be insalled as to block the rod ?
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Old 02-29-2020, 06:56 PM   #2
Overkill-F1
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Default Re: flathead fuel pump push rod

Maybe the large hole in the rear bearing is not lined up with the bushing above it. I found this out as I disassembled mine for rebuild.
The previous owner did a rebuild and when he couldn't put the rod down, he must have just knocked it down and it bent the edge of the bearing into the gap between the two rear journals. It worked but I had a hard time pulling the cam out for my rebuild.
You may be able to look down thru the bushing and see the problem?
Terry

Last edited by Overkill-F1; 02-29-2020 at 07:03 PM.
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Old 02-29-2020, 07:01 PM   #3
sawbuck
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Default Re: flathead fuel pump push rod

thanks... its somthing along that line of thinking... hate to have to pull it apart .the motor sounds so good ..maybe i can get to the bearing from the rear cam cover?
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Old 02-29-2020, 07:07 PM   #4
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Default Re: flathead fuel pump push rod

All you will be able to do is tap the bearing further inwards with another bearing as a punch, not rotate it or pull it out.
Terry
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Old 02-29-2020, 07:14 PM   #5
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Default Re: flathead fuel pump push rod

well that sucks ... what you are saying makes a lot of sense as to the problem ...you have me on the right track... will have to look into it and let you know how it turns out...thank you for the help
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Old 02-29-2020, 08:12 PM   #6
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Default Re: flathead fuel pump push rod

just looked down the hole ..the bearing is to far rearward by about a10th of an inch.do you think i can pull the trans and flywheel get to the rear cover and press it in ?
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Old 02-29-2020, 08:15 PM   #7
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Default Re: flathead fuel pump push rod

There is always an electric fuel pump.
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Old 02-29-2020, 08:19 PM   #8
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Default Re: flathead fuel pump push rod

Quote:
Originally Posted by JSeery View Post
There is always an electric fuel pump.
plan B.. thanks
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Old 02-29-2020, 09:36 PM   #9
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Default Re: flathead fuel pump push rod

Quote:
Originally Posted by sawbuck View Post
just looked down the hole ..the bearing is to far rearward by about a10th of an inch.do you think i can pull the trans and flywheel get to the rear cover and press it in ?
After you remove the idler gear between the rear end of the cam and the oil pump, you can see the entire edge of the bearing in the bore. If you carefully place an old bearing on the existing bearing, edge to edge, you could tap it forward if you're careful.
I would place something solid over the old bearing to spread the force of the tapping. If it was mine I would try this before removing the cam, lifters, etc. because you would still have to pull trans, flywheel and rear cover.
Terry
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Old 02-29-2020, 09:42 PM   #10
JSeery
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Default Re: flathead fuel pump push rod

We may be getting the cart before the horse here. Need to determine what the problem actual is first. It is most likely the cam bearing being in the wrong position, but that needs to be verified.
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Old 02-29-2020, 10:00 PM   #11
sawbuck
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Default Re: flathead fuel pump push rod

it has been verified ,,the bearing is to far foward by about a 10th of an inch
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Old 02-29-2020, 11:05 PM   #12
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Default Re: flathead fuel pump push rod

Time for electric fuel pump.
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Old 02-29-2020, 11:20 PM   #13
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Default Re: flathead fuel pump push rod

Does the rod go in but is a tight fit?
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Old 03-01-2020, 12:02 AM   #14
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Default Re: flathead fuel pump push rod

Quote:
Originally Posted by sawbuck View Post
it has been verified ,,the bearing is to far foward by about a 10th of an inch
Ok, missed that! I still vote for the electric fuel pump.
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Old 03-01-2020, 02:48 AM   #15
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Default Re: flathead fuel pump push rod

Quote:
Originally Posted by JSeery View Post
Ok, missed that! I still vote for the electric fuel pump.
Post #6 says that the cam bearing is too far REARWARD by 1/10 of an inch. Best to verify which it is.
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Old 03-01-2020, 06:10 AM   #16
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Default Re: flathead fuel pump push rod

Quote:
Originally Posted by sawbuck View Post
just looked down the hole ..the bearing is to far rearward by about a10th of an inch.do you think i can pull the trans and flywheel get to the rear cover and press it in ?
Quote:
Originally Posted by sawbuck View Post
it has been verified ,,the bearing is to far foward by about a 10th of an inch
As 40 said....its best to verify where the bearing actually is, and I'm also wondering if it's the bearing that's actually preventing the fuel pump pushrod from moving up and down in the first place?
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Old 03-01-2020, 06:53 AM   #17
sawbuck
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Default Re: flathead fuel pump push rod

Quote:
Originally Posted by JM 35 Sedan View Post
As 40 said....its best to verify where the bearing actually is, and I'm also wondering if it's the bearing that's actually preventing the fuel pump pushrod from moving up and down in the first?
i think so , i can see the edge of the bearing .it wont allow the rod to drop down contact the cam lobe ..
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Old 03-01-2020, 06:58 AM   #18
sawbuck
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Default Re: flathead fuel pump push rod

Quote:
Originally Posted by flatjack9 View Post
Does the rod go in but is a tight fit?
no it stops when it hits the edge of the bearing.. i have not tried to force the rod past the bearing ..
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Old 03-01-2020, 10:17 AM   #19
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Default Re: flathead fuel pump push rod

I know I posted earlier but this seems like the type of problem that will only get worse if you try to enlarge or move the cam bearing without disassembly.
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Old 03-01-2020, 10:38 AM   #20
sawbuck
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Default Re: flathead fuel pump push rod

i think i got it ...i ground down an extra rod and worked it in and around ...the bearing was just over lapping about a10th inch...the good rod fits and hits the lobe and goes up and down ...going back together now .. find out soon...thanks all
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