# US 4,392,464 A · Cylinder head oil distribution system for certain Harley-Davidson motorcycle engines

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- Number: US 4,392,464 A
- Document ID: US4392464A
- Status: Granted
- Kind: A
- Application number: 06/266,802
- Filed: 1981-05-26
- Granted: 1983-07-12
- Earliest claimed: 1981-05-26
- Inventors: Kenneth E. Woodward; Terry L. Zeiger
- Web page: https://patentgrep.com/patent/US4392464A

## CPC

- F01M 11/02: Arrangements of lubricant conduits
- F02B 61/02: for driving cycles
- F02B 75/22: with cylinders in V, fan, or star arrangement
- F02B 2075/027: {four}
- F02B 2075/1808: {two}
- F02B 2275/34: Lateral camshaft position
- F02F 7/006: {Camshaft or pushrod housings}
- F01M: LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- F02F: CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES

## Abstract

An improved oil circulating system for lubricating engine heads of certain HARLEY DAVIDSON motorcycles includes a Y fitting connected to an oil outlet of the crankcase, a first oil tube extending from the fitting to an oil inlet of the rear head of the engine, a second tube extending from the Y connection to an oil inlet of the head of the front cylinder, and a plug for plugging an oil outlet of the head of the rear cylinder. To install the device, the original oil tube leading from the oil outlet of the crankcase to the oil inlet of the head of the rear cylinder is removed, and an oil tube leading from the oil outlet of the head of the rear cylinder to the oil inlet of the head of the front cylinder also is removed.

## Claims

### Claim 1

An improved oil distribution apparatus for distributing oil through the front and rear cylinder heads of a HARLEY-DAVIDSON twin cylinder V-type motorcycle engine having said front cylinder inclined at a 45.degree. angle relative to said rear cylinder and having only a single threaded oil outlet from the crankcase thereof, said rear cylinder head having a threaded oil inlet disposed in a lower portion of said rear cylinder head, said rear cylinder head also having a threaded oil outlet disposed in a front side of said rear cylinder head, said front cylinder head having a threaded oil inlet disposed on a rear side of said front cylinder head, said apparatus comprising in combination:
(a) a tubular Y fitting means having a first tubular extension with a threaded portion for threaded sealing engagement with said crankcase oil outlet;
(b) a first oil tube external to said front and rear cylinders having an upper fitting sealably attached to an upper end thereof for threaded, sealing engagement with said oil inlet of said rear cylinder head;
(c) a first fitting for removable, sealable, connecting of the lower end of said first oil tube to a second tubular extension of said Y fitting means;
(d) a second oil tube external to said front and rear cylinders;
(e) a second fitting for removable, sealable, connecting of the lower end of said second oil tube to a third tubular extension of said Y fitting means;
(f) a third fitting for removable, sealable, connecting of the upper end of said second tube to said oil inlet of said front cylinder head; and
(g) a threaded plug for sealing closed said oil outlet for said rear cylinder head.

### Claim 2 (depends on 1)

The apparatus of claim 1 wherein said first tubular extension of said Y fitting means includes a threaded end portion, and said first fitting includes a nut portion rotatably disposed on said lower end of said first oil tube for threaded, sealing engagement with said threaded portion of said first tubular extension.

### Claim 3 (depends on 2)

The apparatus of claim 2 wherein said second tubular extension includes a threaded portion and said second fitting includes a nut portion rotatably disposed on the lower end of said second oil tube for threaded, sealing engagement with the threaded portion of said second tubular extension, and wherein said third fitting includes a nut portion rotatably disposed on said upper end of said second oil tube for threaded, sealed engagement with an elbow fitting, said elbow fitting having a threaded portion for threaded, sealed engagement with said oil inlet of said front cylinder head.

### Claim 4 (depends on 3)

The apparatus of claim 3 wherein the length of said first oil tube is approximately equal to the distance between said oil inlet of said rear cylinder head and said Y fitting means, and the length of said second oil tube is approximately equal to the distance between said Y fitting means and said oil inlet of said front cylinder head.