HEMI Tech: Oil systems- filters, pumps, pans

There's 2 part numbers for the low deck Dodges. 1532875 & 1612813 both are listed for 53-early 55 engines. Don't know why they'd have 2 different numbers, but I'd think both pumps would have the same lenth shaft or there'd be 2 different lenth Int. shafts. someone on another site(you, maybe?) reported being sent a rebuild kit for some other oil pump, maybe that's it.

 

george
I think that was me with that post george ......

I supposabally got the answer why the 241 hemi oil pump kit shaft was shorter. the guys at egge figued it out why there P/N pk 107 they sent to me for the 241 hemi was shorter 4.75" well....... appears someone replaced my oil pump with a new version LA 318-340 pump .. that is why my pump shaft was a 1/4" longer. 5".

so I'll see what it looks like when it arrives.. fingers are crossed.

 

You would know if you had a 318-340 pump. There would be an adapter plate between the pump and main cap. I believe that the earliest 241 used a very short pump. That housing number would be 1406253 at 2" height. They also later used ( I believe) a 1618952 housing with a 2 1/8" height.

 

here is the oil pump I removed from my 241 hemi .. minus the main drive rotor shaft .
My main rotor shaft was 5" long and the one egge sent to me for the oem stock 241 hemi was 14" shorter..
egge says that my main shaft is from a earlier LA 340 sb .. that does not make any sense either because a 340 pump has a direct shaft from the dist gear to the oil pump andhas a hex tip to it ..

mine has an intermediate shaft and gear with a knife edge that fits into a slotted gear on the end of the main oil pump shaft [/ATTACH] gear.

think I'm just going to get a new complete oil pump for the hemi .. no more kits. ,, I just don;t know what the previous engine builder installed in there.

 

The bottom plate on the LA & the 331-392 oil pumps are pentastar shaped, so it's not an LA. Not familiar with the Dodge pump, so iguess we'll wait for TR, Gary or someone who is to comment on if it's a Dodge hemi OEM pump nor not.

 

The pump should have a number cast into it along the barrel for the relief valve.

 

I see these numbers on the cover 1406255-17.
I'll look for the other casting number on the body.

 

That matches to the 1612813 & 1532875 low deck dodge oil pumps, housing number should be 1406253
Apparently both pumps use the same body & cover..could one be higher volume than the other?

 

upon further sight on those numbers on the cover plate........
it is 1406255-27 not -17 .. which shouldn't make much of a big deal I guess.

 

George
Thanks for looking those numbers up!

here are the oil pump housing numbers on my 241 hemi oil pump
1618952-18 date on it is 4-11
The plate cover numbers are 1406255-27

so........ it appears that theses numbers are correct for the low deck 241hemi oil pump.

Now .. why was the main rotor shaft longer than the stock one from egge?
My guess is someone put the wrong main shaft in with a shorter intermediate shaft dist gear .. or ?????????? IMO

 

It was longer than the one from Egge because their listing is for the earliest Dodge pump that has the 2 inch thick housing. 1406253 housing takes the shorter shaft.

Your pump takes a longer shaft because the housing is thicker. Your housing is thicker because it is a later style pump. For whatever reason, some Dodge engines were built using the 1618952 pump housing.

 

thanks TR

finally got to the bottom of this issue. ..
yes .. my dodge is a 1954 241 hemi .
it's all about the year
differences .. go mopar .

 

Up on the HH site a guy has in the Classifieds (instead of the Forum for some reason) that he welded 454 pan onto the 51-4 pan rails & said it did well. Claims "can hold up to 8 qts". Said he seeing if Bob might put the idea into production, might help those with the truck/marine/Ind & early 331s.

 

A lot of different pan adaptations have been tried. The BBC pan is 3 inches longer and 3/8" narrower than an early hemi. A person might be better off using a SB Mopar pan for a donor sump. Or for that matter, a new aftermarket early hemi pan for $85 or so and modify it.

 

...never tried a brand 'x' pan but have used the 318/360 pick-van rear sump as a donor. Some fussing is needed but not a major project for a decent fabricator.

.

 

Here is a hard to find part that most have never seen.... or will see.
It is an oil pump cover for the 51-56 style Chrysler (and Desoto) pumps usually found with the swinging pickup. EXCEPT, this one uses a screw in pick-up tube.
Just another example of never say never.

 

I used s pump from a 354 on my 341 Desoto. No modifications were necessary. I was getting 85 psi while priming with a drill. I used a 1/16" shim on the pump spring to gain more pressure and a bronze gear on the shaft just to be sure. It's a Contreras roller with a pressed on iron gear.

 

Can anyone tell me is a 53 desoto 276 a full flow system as I tried to knock out what would be the check valve with no luck . It seems to be vary solid . Thanks in advance.

 

Don't know on the DeSoto but some of the 51-3 Chrs are solid, not drilled for the check ball.

 

Was it a '56 car engine or a 57-9 truck engine?

 

The one I used on my 341 was a 56 354. No modification necessary. My neighbor adapted the Hot Heads 340 pump to his 241 Dodge. The oil pan had to be modified for clearance and there were pump shaft length issues.

 

About 50-50 on these. Once the block is cleaned you can shine a light in the hole and tooling marks will be obvious or the valve will be obvious.

.

 

I'm running my oil pressure sending unit from the hole next to the distributor on my 354. Now I need to plumb and wire an electric fuel pump cut off to my oil pressure. Is the hole next to the distributor the only place to get oil pressure? I'm limited on space between my firewall and the back of the block so I'm not too crazy about plumbing in a T fitting with the cut off and pressure sending unit.

 

The next best location would be at the filter mount. If you have an aftermarket adapter or, perhaps, a remote filter, then you might be able to tap into the mount after the filter. Many gm and ford filter mounts have taps in their mounts for pressure senders so it is not a new idea.

.

 

Like the fitting on top of filter adaptor in the picture?




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Looks like the right location, above the center if the filter and presumably inline with the return to the block.

...You really should ditch the fram and buy WIX filters.


.

 

Good catch! Blew right by me!

 

Run a line into the cabin and put the T fitting inside. That's where it is in my '34. Been there for close to fifty years, now.

 

That's funny, you busted me on the Fram 3 years ago when I started assembling the engine. I actually bought a WIX right after that. Since I've only got the motor running recently I need to drain the oil and put the new filter on.

I'll put a pressure gauge on the fitting and if it matches the other pressure gauge then I'll run the fuel pump switch there, otherwise I'm going to run them remotely off a t connection.


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What form does this "cut off" take ? A commercial item?
Is it by-passed when starting the engine; or how is it brought into use when the engine runs?

gatz