Oil pressure

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Joshua Mitchell
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Zip Code: 77523
Tractors Owned: 1952 Cub (LITTLE RED MISTRESS)
1948 Cub
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Oil pressure

Postby Joshua Mitchell » Thu Jan 14, 2021 7:38 pm

OK.
I have gone through what I hint hint know.

Replaced gaskets and many other items. Had oil pressure when started everything but now its all back together and no oil. HELP

Jdsharp
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Re: Oil pressure

Postby Jdsharp » Thu Jan 14, 2021 7:48 pm

Did you prime the oil pump?

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Glen
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Re: Oil pressure

Postby Glen » Fri Jan 15, 2021 1:55 am

Hi,
Sometimes after sitting, or the engine being apart, the Cub oil pump won't suck up oil from the oil pan, then the pump needs priming.
Below is a post I made about priming the oil pump, the post is part way down the page. :)

viewtopic.php?f=1&t=91765&start=60

The engine bearings and crankshaft can be damaged by running the engine with no oil pressure.

Crimson Tim
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So far, Paul and Ringo have arrived. John and George were supposed to follow ages ago, but apparently have gone awol. Long story.
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Re: Oil pressure

Postby Crimson Tim » Fri Jan 15, 2021 10:24 am

Amongst the gaskets you replaced, does that include the gasket at the oil pump itself? That’s about the only gasket where thickness is critical. If it’s too thick, the clearances in the pump will be too large and it won’t be able to provide sufficient pressure.

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Joshua Mitchell
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Tractors Owned: 1952 Cub (LITTLE RED MISTRESS)
1948 Cub
1948 M
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1 - A yr unknown
1 - B yr unknown

Re: Oil pressure

Postby Joshua Mitchell » Fri Jan 15, 2021 1:58 pm

I HAVE NOT PRIMED THE PUMP. I WAS LOOKING IN THE MANUAL BUT CANT FIND A PROCEDURE. I WILL TRY WHAT GLEN POSTED GOING THROUGH THE PRESSURE HOLE IN THE HOUSING. THE ENGINE HAD 2 STUCK EXHAUST VALVES WHEN I BOUGHT IT AND I HAD TO REMOVE THE HEAD TO DECOKE THEM. SINCE I WAS THAT FAR I WENT AHEAD AND REMOVED ALL COVERS, PANS AND COOLING SYSTEM TO DO A THOROUGH CLEANING. I DID NOT REMOVE THE ROTATING MASS FROM THE BLOCK. AFTER CLEANING EVERYTHING AND BLASTING IT, I REPAINTED IT ALL AND REASSEMBLED. I DIDNT WANT IT TO START UNTIL THE OIL SYSTEM WAS PRIMED SO NO PLUG WIRES YET. I FIGURED IT PRIME BY TURNING OVER. IF THIS IS NOT THE CASE PLEASE FEEL FREE TO LET ME KNOW. I INTENDED TO DO A COMPLETE NO BOLT UNTURNED RESTORATION OF THE CUB BUT IN THE END I DECIDED TO GO THROUGH EVERYTHING AND MAKE IT PRETTY AND USEABLE. MY OTHER CUB WILL GET THE COMPLETE JOB SINCE I HAVE SEVERAL TRACTORS NOW. I NEED ONE TO PLAY ON MEANWHILE. I WOULD POST PICS BUT I CANT GET THEM SMALL ENOUGH FOR THE SYSTEM TO ALLOW IT.

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Don McCombs
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Re: Oil pressure

Postby Don McCombs » Fri Jan 15, 2021 3:58 pm

PAPAs Farmall Family wrote:I FIGURED IT PRIME BY TURNING OVER. IF THIS IS NOT THE CASE PLEASE FEEL FREE TO LET ME KNOW.

IT'S NOT THE CASE. FOLLOW GLEN'S RECOMMEDATION.
Don McCombs
MD, Deep Creek Lake

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The best teachers are those who show you where to look, but don't tell you what to see.
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Gary Dotson
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Re: Oil pressure

Postby Gary Dotson » Sat Jan 16, 2021 8:55 am

Oil pressure will not register, on the gauge, until the filter chamber completely fills. Pressure should register within a few seconds of start up but you'll never see it cranking.

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Re: Oil pressure

Postby Eugene » Sat Jan 16, 2021 12:03 pm

Prime the oil pump as Glen suggested.

To check to see if the oil pump is working, leave the cap and filter out of/off the oil filter housing. Crank the engine with the starter. Couple secends you will see oil flowing out of the hole you used to prime the oil pump.

OIl being pumped out the hole, install the oil filter and cap. You are good to go.
I have an excuse. CRS.

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Joshua Mitchell
Posts: 25
Joined: Mon Dec 28, 2020 2:22 pm
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Tractors Owned: 1952 Cub (LITTLE RED MISTRESS)
1948 Cub
1948 M
2 additional M's yr unknown
1 - A yr unknown
1 - B yr unknown

Re: Oil pressure

Postby Joshua Mitchell » Tue Jan 19, 2021 10:52 pm

Thanks for all the help. Primed her up and started. Purrrrrrs like a kitten with good pressure. But now very little throttle response.

inairam
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Re: Oil pressure

Postby inairam » Wed Jan 20, 2021 7:26 am

PAPAs Farmall Family wrote:Thanks for all the help. Primed her up and started. Purrrrrrs like a kitten with good pressure. But now very little throttle response.


Make sure the linkage from the governor to the throttle is free and the lever on the governor is free to move. Adjust the carb to governor linkage per the manual. If that does not do anything replace the governor spring - which is usually always a good idea.
When you only have 9 horsepower you need to know the names of all of the ponies!

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Rick Spivey
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Re: Oil pressure

Postby Rick Spivey » Wed Jan 20, 2021 8:14 am

PAPAs Farmall Family wrote:Thanks for all the help. Primed her up and started. Purrrrrrs like a kitten with good pressure. But now very little throttle response.


Did you replace the small clamp-like support that helps guide and steady the throttle rod? It attaches to one of the head bolts and loosely wraps around the rod. Without it, the rod can bend too much, especially if the rest of the linkage at the governor is binding somewhat, and your throttle response will be poor.
Rick Spivey
'52 Cub ("Great Personality") 148xxx
'48 Cub with FH ("Gunny Cub") 38xxx
'57 Lambretta (a slow work in progress)
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