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Joined: Dec 2008
Posts: 12
Grease Monkey
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OP
Grease Monkey
Joined: Dec 2008
Posts: 12 |
Got a 1927 that the oil pressure will be zero when I start it cold then all of a sudden it will jump up. Once it jumps up it stays but it may be 10-15 secs. Normally it pegs the gauge cold and 3-5 warm. It overheated the number 2 rod bearing. Rod and Main bearings have been redone but I want to be sure the oil system is right. Took oil pump apart and it looks good. What about the Billy Possum replacement gear pump I read about??
Last edited by lovede; 05/09/11 07:21 PM.
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Joined: Feb 2008
Posts: 802
ChatMaster - 750
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ChatMaster - 750
Joined: Feb 2008
Posts: 802 |
I would check the oil lines in the engine for cracks and the inside of the pump for weak springs on the vanes and scoring. The delay may be due to oil too thick or pump losing some prime...again weak springs and or scoring. Should run about 8-10 warm at speed, 5 or so at idle. Burned rod can be caused by being adjusted too tight or no oil getting to that trough because of a plugged oil line or a crack in that line.
28 Chevy LO Capitol 1 ton, 28 National 2 dr coach, 71 Chevy Custom Camper 3/4 ton. Also 23 Oldsmobile Economy truck and a 24 Olds sport touring.
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Joined: Dec 2001
Posts: 10,379 Likes: 1
Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
Joined: Dec 2001
Posts: 10,379 Likes: 1 |
I would not worry about replacing the pump just yet. Check the level of your oil by the dipstick. If it indicates full, add another quart of oil to the crankcase. If it is very low you may have to add additional oil. If this correction does not solve your problem you can consider changing the oil pump. I am not a fan of changing to the gear oil pump unless you modify the system and install a 1937 or later gear pump. The 28 engine is designed to receive max volume of oil to insure the troughs are kept full. A vane pump fits this requirement. Hi volume, low pressure. A gear pump provides high pressure and flow. But, we don't really need pressure. No bearings in the 28 or pressure fed, they are all supplied oil by splash and drip from the many reservoirs designed for that purpose.  
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: Jun 2005
Posts: 408
Backyard Mechanic
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Backyard Mechanic
Joined: Jun 2005
Posts: 408 |
I have covered some 20000 miles in my "28". On start-up there is zero pressure till it finally wanders up the line to the gauge at which point it hits 10. From then on it wanders back down to about 5 as things warm up and thin out. This is somewhat different to my Triumph TR3a which hits 70 on start-up and then wanders back to 55.
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Joined: Apr 2010
Posts: 1,284
ChatMaster - 1,000
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ChatMaster - 1,000
Joined: Apr 2010
Posts: 1,284 |
My 28 starts cold on 12 to 15 and drops to 5 at road speed when hot.
cheers
ray
Some say "Street is neat". I prefer "1928 is great" I have documented my 45 years with a 1928 Chev Tourer, from 1973 to 2018, and regulary add other items that I hope are of interest to others. Your comments are most welcome.The story of the Red Chev can be viewed at http://my28chev.blogspot.com/
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