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Old 07-14-2010, 05:15 AM   #1 (permalink)
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Oil Flow - Harley Engines

Today we were discussing oil coolers and the question of oil routing came up. None of us really had a clue about how Harley does it. After the oil leaves the oil pump, does it go to the oil filter, then through the oil cooler, if the bike has one? If it takes that route, where does it go from there?

If this is wrong, how do Harley engines circulate the engine oil?
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Old 07-14-2010, 05:57 AM   #2 (permalink)
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Evo engine:

Oil tank to pump.

Pump to engine.

Engine to oil filter.

Filter to tank, via return line to pump back to tank.

TC Engine:

Oil tank to Pump.

Pump to filter.

Filter to engine.

Engine to tank.


In the case of the Evo, you'd attach a cooler to the return line from the filter, before returning to the pump/oil tank.

In the cased of the TC engine, you'd attach a cooler via an adaptor, to the filter moutning base, and it would circulate oil prior to entering the engine. Half the reason for this is due to the TC engine having a higher pressure pump and oiling system, and because the oil pump is INTERNAL on the TC engine, and not hanging off the case, where you can access it easily.
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Old 07-15-2010, 03:38 AM   #3 (permalink)
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Quote:
Originally Posted by Dave63 View Post
Evo engine:

Oil tank to pump.

Pump to engine.

Engine to oil filter.

Filter to tank, via return line to pump back to tank.

TC Engine:

Oil tank to Pump.

Pump to filter.

Filter to engine.

Engine to tank.


In the case of the Evo, you'd attach a cooler to the return line from the filter, before returning to the pump/oil tank.

In the cased of the TC engine, you'd attach a cooler via an adaptor, to the filter moutning base, and it would circulate oil prior to entering the engine. Half the reason for this is due to the TC engine having a higher pressure pump and oiling system, and because the oil pump is INTERNAL on the TC engine, and not hanging off the case, where you can access it easily.
Thanks Dave. On these engines, how does the oil get to the valve train? Are there internal oil passages in the cylinders and heads or is it done in with the push rod assembly?
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Old 07-15-2010, 04:41 AM   #4 (permalink)
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Thanks Dave. On these engines, how does the oil get to the valve train? Are there internal oil passages in the cylinders and heads or is it done in with the push rod assembly?

The oil pump pushed the oil through a passage, to the pushrods, into the rocker shafts, then gravity retutns it, via the pushrod tubes and another port, back to the sump.
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Old 07-15-2010, 09:53 AM   #5 (permalink)
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Quote:
Originally Posted by Dave63 View Post

TC Engine:

Oil tank to Pump.

Pump to filter.

Filter to engine.

Engine to tank.

This is another important reason to change the oil filter on a TC...the oil flows from the tank to the filter, then to the engine..If your filter is not flowing due to being clogged, then the motor starves for oil..not good...
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Old 07-17-2010, 01:07 PM   #6 (permalink)
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Originally Posted by Blackdog 15 View Post
This is another important reason to change the oil filter on a TC...the oil flows from the tank to the filter, then to the engine..If your filter is not flowing due to being clogged, then the motor starves for oil..not good...
Agreed! So in that line of reasoning, is every 3 to 5k miles excessive? That is the interval I use on my TC88.
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Old 07-17-2010, 01:17 PM   #7 (permalink)
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Agreed! So in that line of reasoning, is every 3 to 5k miles excessive? That is the interval I use on my TC88.

Here's an interesting fact: 3000 mile oil changes have been in effect for over 50 years.

Oil and filter has technologically changed and advanced far beyond the oil in the beginning of that 50 years, but the intervals are still the same.

Why is this.

My work fleet changes oil every 5K, and rarely if ever has an engine failure, and sells the cars at 150K via public auction.
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Old 07-17-2010, 01:20 PM   #8 (permalink)
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I share your concerns, but I am not an expert on the newer models at any level.

No matter what the route the oil takes, I heard that there was an oil pump upgrade for my bike that increased flow and scavenging (sp?) and had a better adjustment tensioner. It was only 400 bucks, which is cheaper than a blown engine.

That was the idea I chose.

(I know that MoCo has a part number for this upgrade and I know it's buried somewhere in their website's parts list--I have seen it. I did a quick search and I cannot find it. A savvy member here will post the parts number of the correct nomenclature name.)
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Old 07-28-2010, 01:14 AM   #9 (permalink)
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Originally Posted by Pete View Post
Today we were discussing oil coolers and the question of oil routing came up. None of us really had a clue about how Harley does it. After the oil leaves the oil pump, does it go to the oil filter, then through the oil cooler, if the bike has one? If it takes that route, where does it go from there?

If this is wrong, how do Harley engines circulate the engine oil?
I hope that we can see it with photos so that we would clearly know what to say.
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Old 07-28-2010, 07:05 AM   #10 (permalink)
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Originally Posted by The Tourist View Post
I share your concerns, but I am not an expert on the newer models at any level.

No matter what the route the oil takes, I heard that there was an oil pump upgrade for my bike that increased flow and scavenging (sp?) and had a better adjustment tensioner. It was only 400 bucks, which is cheaper than a blown engine.

That was the idea I chose.

(I know that MoCo has a part number for this upgrade and I know it's buried somewhere in their website's parts list--I have seen it. I did a quick search and I cannot find it. A savvy member here will post the parts number of the correct nomenclature name.)
Is this what you're talking about?

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