Re: oil filter plumbing
Posted by HH56 On 2017/10/9 20:21:43
I do not believe that particular letter is applicable to the 356 engine for the simple reason that Packard had some noisy lifter issues in the early 40s that was traced to low flow and pressure lost thru the filter. I am not even sure it was correct for the later non 356 engines with hydraulic lifters because some of the same concerns were still applicable on the 288/327 blocks.
There were several bulletins for the 356 engine revising the filter canister to try and control the issues with full lifter flow thru the filter. A plumbing revision was made for 42 and this bulletin mentioning the "fix" with the plumbing rerouting was issued in 43. On earlier engines Packard suggested the mechanics install another tee so the pigtail could be added to feed the lifter gallery directly and there would be another outlet available to feed the filter. There was an orifice on the feed line to the original filters to farther restrict the amount of oil thru the filter so the lifter gallery would get a stronger flow. Later canisters with the side inlet and bottom outlet had the restriction built in. On the 40 and 41 356 engines mechanics also had to drill a hole in the block so the filter could drain into the crankcase. Believe the port into the crankcase was standard from 42 thru 50.
Aside from eliminating the second tee used on the early engines by changing to the 4 way fitting on the 42 and later engines, that final plumbing fix with the bypass flow dumping into the crankcase was to the best of my knowledge carried thru on all 356 engines and was standard with all engines 51 thru 54.
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There were several bulletins for the 356 engine revising the filter canister to try and control the issues with full lifter flow thru the filter. A plumbing revision was made for 42 and this bulletin mentioning the "fix" with the plumbing rerouting was issued in 43. On earlier engines Packard suggested the mechanics install another tee so the pigtail could be added to feed the lifter gallery directly and there would be another outlet available to feed the filter. There was an orifice on the feed line to the original filters to farther restrict the amount of oil thru the filter so the lifter gallery would get a stronger flow. Later canisters with the side inlet and bottom outlet had the restriction built in. On the 40 and 41 356 engines mechanics also had to drill a hole in the block so the filter could drain into the crankcase. Believe the port into the crankcase was standard from 42 thru 50.
Aside from eliminating the second tee used on the early engines by changing to the 4 way fitting on the 42 and later engines, that final plumbing fix with the bypass flow dumping into the crankcase was to the best of my knowledge carried thru on all 356 engines and was standard with all engines 51 thru 54.
Attach file:
(171.24 KB)
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