mfg Posted June 7 Report Share Posted June 7 What mechanical malady did Studebaker Avanti R3-4 engines have in common with the '55-'56 Packard V8 engine? Link to comment Share on other sites More sharing options...
Dwight FitzSimons Posted June 7 Report Share Posted June 7 Lubrication problems? Link to comment Share on other sites More sharing options...
Nelson Posted June 7 Report Share Posted June 7 Wrist pin? Link to comment Share on other sites More sharing options...
brad Posted June 7 Report Share Posted June 7 yes, the wrist pin is shrunk in the rod and sometimes works loose. Link to comment Share on other sites More sharing options...
Dwight FitzSimons Posted June 8 Report Share Posted June 8 And, the solution for this is "buttons" on the ends of the wrist pins? --Dwight Link to comment Share on other sites More sharing options...
mfg Posted June 8 Author Report Share Posted June 8 15 hours ago, Nelson said: Wrist pin? 11 hours ago, brad said: yes, the wrist pin is shrunk in the rod and sometimes works loose. Interesting thought concerning loosening wrist pins..This will happen on the Packard with high miles, however, never heard it was a potential problem on the rare R3. Link to comment Share on other sites More sharing options...
mfg Posted June 8 Author Report Share Posted June 8 16 hours ago, Dwight FitzSimons said: Lubrication problems? Yes, that was my thought.....The Packatd is known for engine oil pump issues..and the R3&R4 oil pump supposedly has a design flaw concerning its fixed pin/bottom plate weakness. Link to comment Share on other sites More sharing options...
Nelson Posted June 10 Report Share Posted June 10 I didn’t know they had an oil pump problem. I know Lionel Stone tried making R3 pumps out of standard pumps by boring the gear pockets deeper and using six cylinder pump gears. Dwight, didn't you have a failure on one of your R3’s using this setup? Link to comment Share on other sites More sharing options...
Dwight FitzSimons Posted June 10 Report Share Posted June 10 10 hours ago, Nelson said: I didn’t know they had an oil pump problem. I know Lionel Stone tried making R3 pumps out of standard pumps by boring the gear pockets deeper and using six cylinder pump gears. Dwight, didn't you have a failure on one of your R3’s using this setup? Yes, exactly; My R3's second oil pump failed because Lionel Stone's machinist machined the gear pockets of a standard housing deeper for the R3's longer gears. That made the iron housing too thin and it broke. If I had known then what I know now I would have given the engine builder the NOS standard oil pump to install that I already had (& still have). Link to comment Share on other sites More sharing options...
Nelson Posted June 10 Report Share Posted June 10 WhenStudebaker received the shipment of R3 rods they failed inspection for the wrist pin diameter was at the high limit. The rods got approved with a deviation permit. I know of several failures due to the wrist pin broaching the cylinders. With possibly 50 of 110 or so engines using the R3 rod, several is a pretty high failure rate. Link to comment Share on other sites More sharing options...
Dwight FitzSimons Posted June 10 Report Share Posted June 10 1 hour ago, Nelson said: When Studebaker received the shipment of R3 rods they failed inspection for the wrist pin diameter was at the high limit. The rods got approved with a deviation permit. I know of several failures due to the wrist pin broaching the cylinders. With possibly 50 of 110 or so engines using the R3 rod, several is a pretty high failure rate. No doubt that is why Dave Thibeault put "buttons" on either end of the wrist pins on my R3. --Dwight Link to comment Share on other sites More sharing options...
Nelson Posted June 10 Report Share Posted June 10 Dave had a failure on an R4. He was able to sleeve the cylinder and save the engine. Link to comment Share on other sites More sharing options...
brad Posted June 11 Report Share Posted June 11 We use spiral locks to retain the pins in the pistons. It's less weight. Link to comment Share on other sites More sharing options...
mfg Posted June 11 Author Report Share Posted June 11 This is interesting, little known stuff!! Link to comment Share on other sites More sharing options...
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