High-volume oil pump
Thread Starter
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Laughing Gas
Joined: Aug 2004
Posts: 964
Likes: 1
From: Roseburg, OR
High-volume oil pump
Well, I'm on my way to Napa to get a distributor gear. 
I put a high-flow oil pump in my 400 when I built it (in all fairness, I hadn't read the warnings that the distributor gear / oil pump shaft were in danger), and sure enough, about 3,000 miles later, I get on it leaving a stop and "POP!"-- backfire ('bout made an old guy out to check his mail poo himself), engine dies, no oil pressure when cranking. Pulled the distributor cap, and sure enough, rotor doesn't turn when cranking.
Huh.
So let this get added to the archives, feel free to point to it when someone insists there's no possible harm in adding a high-volume oil pump.
Worst part about it being that I had to have my dad tow me home with his Chevy.
I put a high-flow oil pump in my 400 when I built it (in all fairness, I hadn't read the warnings that the distributor gear / oil pump shaft were in danger), and sure enough, about 3,000 miles later, I get on it leaving a stop and "POP!"-- backfire ('bout made an old guy out to check his mail poo himself), engine dies, no oil pressure when cranking. Pulled the distributor cap, and sure enough, rotor doesn't turn when cranking.
Huh.
So let this get added to the archives, feel free to point to it when someone insists there's no possible harm in adding a high-volume oil pump.
Worst part about it being that I had to have my dad tow me home with his Chevy.
Thread Starter
|
Laughing Gas
Joined: Aug 2004
Posts: 964
Likes: 1
From: Roseburg, OR
Stock distributor (well, stock rotating pieces), I have to assume it is the original 1975 part. This would be one of the 3 or 4 parts of this motor I didn't replace in the rebuild.
Thread Starter
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Laughing Gas
Joined: Aug 2004
Posts: 964
Likes: 1
From: Roseburg, OR
Pulled the distributor today, looks like the roll pin sheered. The gear is now slid up the shaft and jammed at enough of an angle to be completely impervious to my propane torch and hammer blows. Question now being, do I take it to a machine shop and get it pressed off, or do I just buy another distributor?
Thread Starter
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Laughing Gas
Joined: Aug 2004
Posts: 964
Likes: 1
From: Roseburg, OR
The shaft may be slightly bent
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Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
Just for satisfaction beat it off with a sledge or take a gas hatchet to it! But then as long as it looks "undamaged" it may be an acceptable core for the replacement, -no "fun" there tho.
But then as long as it looks "undamaged" it may be an acceptable core for the replacement, -no "fun" there tho.
Last edited by Torque1st; May 9, 2006 at 02:33 AM.
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Thread Starter
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Laughing Gas
Joined: Aug 2004
Posts: 964
Likes: 1
From: Roseburg, OR
There is that possibility. I've also heard stories of cam gears with bad grinds. Regardless, I'm just going to stick with this pump and see what happens. I'm moving going back to school in September, so it'll just be sitting that period of time anyway. As long as I have it running for a couple of 4x4 events that are happening mid-late June, I'm fine.
Elder User
Joined: Apr 2004
Posts: 970
Likes: 3
These are the things we all should think about when adding reengineered parts.
Your stock oil pump most likely bypassed a lot of the oil it was supposed to
provide for the engine as it was not needed. Now we add the HV
which requires more torque because of the volume. Had your engine been
fitted with fully grooved mains and perhaps a little extra clearence
the pumps drive requirements would have dropped as the flow increased and would not strained the drive. Sorry you have the problem perhaps we will help others
in the future. By the way if anyone thinks the Hv or Hp pumps will solve low pressure problems when an engine is warm they better think again, if it leaks that bad it's time to fix the leaks.
Your stock oil pump most likely bypassed a lot of the oil it was supposed to
provide for the engine as it was not needed. Now we add the HV
which requires more torque because of the volume. Had your engine been
fitted with fully grooved mains and perhaps a little extra clearence
the pumps drive requirements would have dropped as the flow increased and would not strained the drive. Sorry you have the problem perhaps we will help others
in the future. By the way if anyone thinks the Hv or Hp pumps will solve low pressure problems when an engine is warm they better think again, if it leaks that bad it's time to fix the leaks.
Thread Starter
|
Laughing Gas
Joined: Aug 2004
Posts: 964
Likes: 1
From: Roseburg, OR
Got new distributor today, remanned from Napa, comes with a nice adjustable vacuum can as well as a pickup. $58 w/core. Will pull the pan on it this weekend, check out the oil pump shaft, and bolt the whole mess back together. The mud beckons. 
Senior User
Joined: Feb 2006
Posts: 212
Likes: 0
Originally Posted by mark a.
I've never broken one. Maby the pump got/has something in it, or maby someone had it apart & reused a old roll pin.
Cargo Master
Joined: May 2003
Posts: 2,561
Likes: 1
From: Earth
Originally Posted by go_racing84
Well, I'm on my way to Napa to get a distributor gear.
I put a high-flow oil pump in my 400 when I built it (in all fairness, I hadn't read the warnings that the distributor gear / oil pump shaft were in danger), and sure enough, about 3,000 miles later, I get on it leaving a stop and "POP!"-- backfire ('bout made an old guy out to check his mail poo himself), engine dies, no oil pressure when cranking. Pulled the distributor cap, and sure enough, rotor doesn't turn when cranking.
Huh.
So let this get added to the archives, feel free to point to it when someone insists there's no possible harm in adding a high-volume oil pump.
Worst part about it being that I had to have my dad tow me home with his Chevy.
I put a high-flow oil pump in my 400 when I built it (in all fairness, I hadn't read the warnings that the distributor gear / oil pump shaft were in danger), and sure enough, about 3,000 miles later, I get on it leaving a stop and "POP!"-- backfire ('bout made an old guy out to check his mail poo himself), engine dies, no oil pressure when cranking. Pulled the distributor cap, and sure enough, rotor doesn't turn when cranking.
Huh.
So let this get added to the archives, feel free to point to it when someone insists there's no possible harm in adding a high-volume oil pump.
Worst part about it being that I had to have my dad tow me home with his Chevy.
I guess I'll find out when I pull the part. It's just been too many years since I put this engine together 