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Re: 62, 340 Hp With Breather Tube, Oil Pump Out
Dan-----
I would say that your oil pressure is a little high and this MAY be contributing to your problem. I think that you'd be better off with a standard pressure pump which is what your application originally used. However, even if you were to change the pump, I don't think that you'd see a major improvement in the conditions you describe. I think you'd find that these cars suffered with this problem to one degree or another since new.
Another factor, though, could be the general condition of the engine. You didn't mention how long it's been since rebuild. As an engine ages and wears, blow-by is increased. As blow-by increases, so does the problem you describe.In Appreciation of John Hinckley -
Forget the pump, HOW do you get to
6 quart (with filter) oil capacity??????????Comment
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Re: 62, 340 Hp With Breather Tube, Oil Pump Out
Dan -
That road draft tube vents from the lifter valley (not the crankcase), and utilizes an air-oil separator canister to prevent liquid oil from venting instead of just vapors; if that canister is not in place, liquid oil can be blown out of the road draft tube. Do you know which oil pan you have?
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Re: 62, 340 Hp With Breather Tube, Oil Pump Out
Dan, I am repeating the others comments somewhat. As we all know or should know the 340 and 360HP are the same deal except for the fuel system. I have been stressing to my FI friend,etc to stick with the stock oil pump. Failure to do so may result in oil soaked ign.points, engine oil leaks and failed ops and pvs. My 63 360 has a stock Melling oil pump. I think it's an M55 but would have to check the number. Readily available and cheap.
Get rid of the oil pump. If you have a 6 qt oil pan and a filter the holds one quart isn't that 7 qts. I see you using just 30 wt oil. That's another issue I don't want to get into as its been beaten to death on this DB and if I mention it look out. Oh I'll mention it anyhow. Most are using 10W-30 diesel oil. Any brand will do (ala Duke).hee. Good luck, JohnComment
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Re: 62, 340 Hp With Breather Tube, Oil Pump Out
It's not clear to me whether you're saying it's pushing oil out the fill pipe or the undercar pipe. What type oil fill cap are you using? Vented mesh or closed?
If the vapor separator can is in the place and a vented fill cap is used, blowby would get my vote as the culprit of blowing condensed oil out either the fill pipe or the undercar road draft tube. High oil level(1 qt) and/or high oil pressure wouldn't likely be much of a contributor.Comment
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Re: 62, 340 Hp With Breather Tube, Oil Pump Out
Excess blowby, a missing or broken "ventilator" (see John's photo), a blocked road draft tube, or too hilgh oil level are all suspects.
I recommend all '61-'62 owners get the RPO parts to implement a PCV system.
I doubt that the oil pump has anything to do with it, but I continue to admonish all to use standard OE replacement oil pumps - NO "HIGH VOLUME" pumps and only use standard volume, high pressure pumps on those engines that had them as OE, which is late '63 mechanical lifter engines and this continued through '65 for mechanical lifter SBs.
Engines with 55-60 psi relief springs are identified by having 80 psi pressure gages. All with 60 psi gages had 40-45 psi relief spring, which is perfectly adequate for even the most severe road applications.
The most common CJ-4 multigrade oil is 15W-40, which is okay for cold starts down to about 15F, which is likely lower than most of us will ever attempt a cold start.
DukeComment
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Re: 62, 340 Hp With Breather Tube, Oil Pump Out
Duke, I ran on to the 10W-30W diesel oil at Walmarts a couple of years ago. They had it in two brands at the time. Was the old stuff. But at the truck stops you typically see 15W-40 like you said. JohnComment
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Re: Forget the pump, HOW do you get to
Loren,
I will validate the oil pan for capacity. Thank you for responding.Comment
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Re: 62, 340 Hp With Breather Tube, Oil Pump Out
Hi John,
I don't know if the air-oil separator is on the engine as I have not seen this engine without the intake manifold installed. I'm guessing that the engine builder as well as a close friend who is a 61-62 Sr. Judge and did some ancillary work to the engine made sure that unit was in place. I will need to validate the oil pan, but I was told by a valued resource, it is the correct pan for the 340Hp engine. Thanks for responding.Comment
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Re: 62, 340 Hp With Breather Tube, Oil Pump Out
Mr. DeGregory,
I think I'm for sure going to 86 the pump. Thanks for riskiing the oil debate too. I'll try the 10W-30 oil. Any words to share on the synthetics?
Thank you for responding to my message.Comment
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Re: 62, 340 Hp With Breather Tube, Oil Pump Out
I think that if you research the archives, the consenus is to use the 15w-40 CI or CJ grade of oil. Synthetics, from my experience, will invent new places to leak from It is hard to keep it in engines with older sealing technologies. For a low mileage use like a classic car it is not worth the cost.Dick WhittingtonComment
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Re: 62, 340 Hp With Breather Tube, Oil Pump Out
Mike,
It's the under car pipe that is adding to my ageing process. The oil fill cap is a reproduction unit that does not have vent holes. I thought it might make sense to ensure the cap was not fully seated on the filler tube so air could be drawn into the engine and perhaps prevent liquid oil being drawn out of the draft tube. Thank you for responding.Comment
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Re: 62, 340 Hp With Breather Tube, Oil Pump Out
OK, thank you for your input.
Regards, Dan K.Comment
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