Tune-up Parts and Common
Spares
Many parts can often be purchased at an auto parts store if you
know the right numbers to ask. Sometimes the store will know what
parts fit the Atomic 4, but most know nothing about marine engines.
The Annapolis NAPA Auto parts store is one of the exceptional
ones; you can give them a call at (410) 263-2695. Cobe Marine (1-800-414-COBE)
in Pasadena, MD tells me they've got a tune-up kit with points, condensor, cap and rotor (Sierra Products #18-5268) as well as other Atomic 4 parts.
I've compiled
a list of part numbers over the years, some of which I've personally
used and some of which I've gleaned from others. I'm no expert
and I don't guarantee anything. It's best to take the old parts
with you to compare. Remember that a lot could have changed since
the boat was delivered. And please,
let me know
about any errors or additions.
|
Spark plugs: | gap: 0.035 |
Hotter plugs |
|---|
|
Champion J8C or RJ8C | RJ12C
(now called Champion 14)
| |
AC #R45 or #M45 |
| |
Autolight 295 | Autolight 308
| |
NGK B6S or BR6S |
|
Note: A reader reports "The NGK BR6S plugs fouled nearly immediately. When I put the old Champion RJ8C's back in the engine loved it. It was called to my attention that some plugs are shorter than the Champions and evidently that lack of reach into the cylinder hampers combustion. Just reporting my experience."
|
Wires: |
|---|
|
Belden 700708 (kit, put on your own ends)
| |
Belden 700999 (custom wire set at Annapolis NAPA store)
| |
Carol 32570 (82 Datsun)
| |
Cooper Automotive "PowerPath" #700705 (longest wire is a slight stretch).
| |
Pep Boys Auto Parts #1924 (for all 1974 Volvo 4 cyl. engines)
|
There are two distributors used. The older engines (serial numbers
71000 through 170507) had a Prestolite distributor which, I'm
told, is the same as that used in a circa 1944 Willys Jeep. Newer
engines (serial numbers 170508 and up) came with a Delco distributor.
Verify which distributor is actually installed in your boat; don't
just depend on the serial number of the engine.
For the Delco distributor, you'll do well at the local auto parts
shop by telling them you've got a 1974 Chevy Vega (thanks to Gavin Peters
for that suggestion). That gives a different condensor part number than
I've got listed, but I guess that's OK.
|
Distributor cap: |
Delco Distributor | Prestolite Distributor |
|---|
| Standard Motor Products DR-437 | Standard Motor Products AL-25 |
| Borg Warner C167 | Echlin AL91 |
| Delco D322R |
| GM 1962446 |
| GP DR93 |
| Echlin RR181 |
|
Rotor: |
|---|
| Standard Motor Products DR-314 | Standard Motor Products AL-102 |
| Delco 423R | Echlin AL-58 or AL-32 |
| GM 800056 |
| GP DR106 (maybe) |
| Borg Warner D152P |
| Echlin RR182R |
|
Condensor: |
|---|
| Standard (Blue Streak) DR-90X | Standard (Blue Streak) AL-106 |
| Borg Warner G126 | Echlin AL-38 or AL-116 |
| Delco D203 |
| GM 1928111 |
| GP DRC3S |
| Echlin RR176 |
|
Points: | timing: just starting to open at TDC |
|---|
| gap: | 0.025 | 0.018 - 0.020 |
|---|
| dwell: | 31 to 34 degrees | 38 degrees |
|---|
| Standard (Blue Streak) DR-2240X | Standard (Blue Streak) AL5661X |
| Delco D108P | Echlin CS-709 |
| GM 1954557 |
| Borg Warner A109V |
| GP DR695 |
| Echlin CS788P |
A number of water pumps have been used over the years. For raw-water-cooled
engines, the most recent (and the replacement for previous models)
is the Oberdorfer M202-3. The Oberdorfer M202-7 has a taller
"shoe" for higher output. This shoe is interchangeable between
the models.
|
Water pump impeller | Oberdorfer
(M202-3 or M202-7) |
Sherwood |
| Oberdorfer #B6593 | Sherwood #09979 |
| Globe (Barco) #815 | Globe #421 |
| Sherwood #295628 | Jabsco #45280001 |
Other recommended spares:
The alternator belt is 3/8" wide and 25" around
(approx. 12" long when flattened). The size may be marked 1 cm x
63.5 cm.
| Alternator belt |
|---|
| Drive King 3L250 "Fractional Horsepower V-belt" |
| Gates HC-3VX-250 or #7250 |
| NAPA Belts 25-06353 |
| BFG Maxipower 3V250 57 ORS-M |
| Goodyear or Kelly/Springfield 10AV0635 |
General Specifications
| Model Designation | UJ, UJR |
|---|
| Engine Type | Four Cylinder, Vertical, 4 Cycle, L-Head |
|---|
| Bore and Stroke | 2 9/16" x 3 1/8" |
|---|
| Total Piston Displacement | 64.46 |
|---|
| Compression Ratio | 6.3:1 |
|---|
| Engine Rotation | Counter-Clockwise (From Flywheel end) |
|---|
| Firing Order | No. 1 on Flywheel End 1-2-4-3 |
|---|
| Reduction Gear Ratio | 2.04:1 |
|---|
| Maximum Operating Angle | Approximately 15 degrees |
|---|
| Fuel | Regular Grade Gasoline |
|---|
| Lubrication Oil | SAE 30 |
|---|
| @ RPM | 600 | 1000 | 1500 | 2000 | 2500 | 3000 | 3500 |
|---|
| Brake Horsepower: | 5 | 7.3 | 11.9 | 16.2 | 20 | 25 | 30 |
|---|
| Suggested Oil Levels | Angle of Install'n | Amount Full | Amount Low |
|---|
| (Quarts) | 0 degrees | 5.75 | 5 |
|---|
| | 5 degrees | 4.75 | 4 |
|---|
| | 10 degrees | 3.5 | 2.75 |
|---|
| | 14 degrees | 2.75 | 2.25 |
|---|
Thanks, Jay!
|
|
