My slant six motor has the canister type oil filter. How do you drain the oil out of the canister? The only plug I see is the one to remove the pressure relief valve. I hate to change out the pump since the oil pump is working good.

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Mike Foust

The canister unscrews from the pump and a nipple to accept a spin on filter will go right in place. You need a suction gun to remove the oil from the canister.

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Joshua

If you want to drain the canister and you don't want to unscrew the canister and pour it out, you use a turkey baster or suction gun.

If you have the first-type canister (lid held on with a central bolt), you will need a male-to-male threaded nipple to replace the canister with a spin-on oil filter. If you have the second-type canister (lid itself screws onto the can) then you can simply remove it and directly install a spin-on filter because the nipple is already present.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

hello uncle d- had an old slantsix with this kind of filter in71. was in an early 61 valiant. seemed to work ok. my q is were these types just as effective and efficient at oil filtering as the later more common spin on oil filters? both seemed to me to work ok. the earlier design (canister) seemed better ecologically and waste wise since it didnt need all that spin on metal. both seemed to mount on the oil pump and avoid that partial flow limitation which 50s 6 cyl. chevrolets had. that design had two lines going out of a hanging canister which screwed into the side of the block. anyway the sl6 canister held a corrugated/pleated paper cylinder which dropped in the canister. downside was you had to fool with rubber flat washers and spring washers to install it. was the old design better? thanks tons bob f

Bob,

If you cut open most spin-on filters you'll find that the filer media is smaller than the element which fits the canister filters. This really isn't an issue unless your engine is heavily contaminated and sending a lot of junk into the filter or the filter has been neglected so long that it goes into bypass. You've probably seen how small oil filters have become and engines are lasting longer than ever.

The other type of filter you describe is a bypass filter. Those are not meant to pass and filter all the oil coming from the pump. Older engines like those were simply not designed for full-flow filtration. For example Studebaker didn't have full-flow oil filtration on their V8s until 1962.

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Joshua

Depends on which spin-on filter we compare to which canister filter element. Parts quality is all over the map (and has been for years). There's nothing to either filter design that gives better performance.
True. This is one reason why modern engines are going back to replaceable-element oil filters.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.