gahorn wrote:.... The spring for the C145/O300, PN 631706 should be wire of .041 ga., and when compressed to 1.56" in length should have a minimum pressure of 5.75 lbs for a used spring, 6.06-6.31 lbs for new.
George where did you get that part number? I just rechecked my parts manual for the c-145 and it is the #637083. I've found no other cross reference except to the part #21352 that it superseded.
FWIW, The new spring I put in my engine is a 637083. I also installed a new 21114 plunger. My cold idling oil pressure (with 20W50 oil) is over 30 before I can refocus on the oil pressure gauge after starting the engine, and is about 52-53 in cruise at 200-210 degrees oil temperature. I haven't yet noticed what the hot idling oil pressure is. Maybe this evening...
Miles
Miles
“I envy no man that knows more than myself, but pity them that know less.”
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gahorn wrote:.... The spring for the C145/O300, PN 631706 should be wire of .041 ga., and when compressed to 1.56" in length should have a minimum pressure of 5.75 lbs for a used spring, 6.06-6.31 lbs for new.
George where did you get that part number? I just rechecked my parts manual for the c-145 and it is the #637083. I've found no other cross reference except to the part #21352 that it superseded.
And as always I'm curious where the heck you got the description for that spring?
Page 41 of the TCM Overhaul Manual X30013, June 1982.
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention. An originality nut (mostly) for the right reasons.
I can't find that part number (631706) available anywhere. It does not match the part number (637083) called out in my parts manual x-30014, November 1982.
Just checked the same table for the C-75 through 0-200 x30010, Jan 1984 and found the same different part number (631706) listed when the parts manual for these engines also has the spring as #637083.
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Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
Very interesting.