We have the Power Machinery model 19-A pictured here, but you’ll find the specs for both the 19 and 19-A below.
The PM Model 19-A replaced the short-lived Model 19 by switching from a reed-valve intake and Tillotson HP carb to a poppet-valve intake with a Tillotson HL carb, while also strengthening the crankshaft bearing arrangement and revising external components for durability.
Here are the specifications, followed by the interesting story of the pictured saw.
PM 19 specifications
| Specification | Details |
|---|---|
| Manufacturer | PM (Power Machinery Ltd.), Vancouver, British Columbia, Canada |
| Model | 19, Pacemaker (original model) |
| Serial number range | 19100 – 191244 |
| Year introduced | 1954 |
| Year discontinued | 1954 |
| Engine displacement | 6.25 cu in (102.4 cc) |
| Number of cylinders | 1 |
| Cylinder bore | 2.125 in (53.9 mm) |
| Piston stroke | 1.750 in (44.4 mm) |
| Cylinder type | Aluminum, chrome plated |
| Intake method | Reed valve |
| Advertised horsepower | 5.5 hp @ 6,000 rpm |
| Maximum engine rpm | 6,000 rpm |
| Weight | 27 lb with 16 in bar & chain (12.2 kg with 40 cm bar & chain) |
| Operator configuration | One-man operation |
| Handlebar system | Rigid |
| Chain brake | None |
| Clutch | Fairbanks-Morse centrifugal |
| Drive type | Direct |
| Construction | Sand-cast magnesium and aluminum alloy |
| Magneto | Wico FW-2401 |
| Carburetor | Tillotson HP-11AB diaphragm |
| Air filter | Skinner ribbon filter element |
| Starter | Fairbanks-Morse automatic rewind |
| Oil pump | Manual |
| Crankshaft main bearings | Ball and caged needle roller |
| Spark plug | Champion J-8 |
| Spark plug gap | 0.025 in (0.63 mm) |
| Breaker point setting | 0.020 in (0.51 mm), WICO points & condenser set X9556 |
| Flywheel / coil air gap | Fixed position |
| Fuel oil ratio | 16:1 |
| Recommended fuel | Regular grade (72–82 octane) |
| Mix oil specification | SAE 30 or 40 |
| Chain pitch | 1/2 in |
| Chain type | Oregon 9C |
| Shortest bar supplied | 14 in (35 cm) |
| Longest bar supplied | 30 in (76 cm) |
| Colour scheme | White or yellow with red accents |
PM 19-A specifications
| Specification | Details |
|---|---|
| Manufacturer | PM (Power Machinery Ltd.), Vancouver, British Columbia, Canada |
| Model | PM Model 19-A |
| Starting serial number | 192001 |
| Year introduced | 1954 |
| Year discontinued | 1956 |
| Engine displacement | 6.25 cu in (102 cc) |
| Number of cylinders | 1 |
| Cylinder bore | 2.125 in (53.9 mm) |
| Piston stroke | 1.750 in (44.4 mm) |
| Cylinder type | Aluminum, chrome plated |
| Intake method | Poppet valve |
| Advertised horsepower | 5.5 hp @ 6,000 rpm |
| Maximum engine rpm | 5,500–6,500 rpm |
| Weight | 26 lb (11.7 kg) powerhead only |
| Operator configuration | One-man operation |
| Handlebar system | Rigid |
| Chain brake | None |
| Clutch | Centrifugal, Fairbanks-Morse |
| Drive type | Direct |
| Construction | Sand-cast magnesium and aluminum alloy |
| Magneto | Wico FW-2401 flywheel magneto |
| Carburetor | Tillotson HL-3A series diaphragm |
| Starter | Fairbanks-Morse automatic rewind |
| Air filter | Wire screen element |
| Oil pump | Manual |
| Crankshaft main bearings | Ball and caged needle |
| Spark plug | Champion J-8 |
| Spark plug gap | 0.025 in (0.63 mm) |
| Breaker point setting | 0.020 in (0.51 mm), WICO points & condenser set X-9556 |
| Flywheel / coil air gap | Fixed position |
| Fuel oil ratio | 16:1 |
| Recommended fuel | Regular |
| Mix oil specification | SAE 30 or 40 |
| Chain pitch | .404 |
| Chain type | Oregon #51 |
| Shortest bar supplied | 16 in (40 cm) |
| Longest bar supplied | 30 in (76 cm) |
| Colour scheme | Red and yellow enamel |
Differences
| Area | Model 19 (Pacemaker) | Model 19-A |
|---|---|---|
| Production period | 1954 only | 1954–1956 |
| Purpose | First-generation Pacemaker design | Revised & reinforced production version |
| Intake method | Reed valve | Poppet valve |
| Carburetor | Tillotson HP-11AB | Tillotson HL series |
| Crankshaft bearings | Earlier bearing arrangement | Strengthened clutch-side bearings using 203 KDD + 303 KDD in tandem |
| Crankcase cover | Original design | Modified to accommodate bearing upgrade |
| Chain cover | Early chain cover (19009) | Revised chain cover (19140) |
| Starter cup | Early Fairbanks-Morse cup (114-54) | Updated starter cup (19207) |
| Fuel shut-off location | Earlier layout | Repositioned to side of fuel tank (from s/n A193593 onward) |
| Reliability | Adequate but stressed under hard use | More durable under heavy load |
| Service life | Shorter in continuous work | Longer working life |
| Collector view | Transitional, historically interesting | Preferred version |
Chainsaw story
This saw is now part of collector Tim Hunt’s collection, and it came with a story.
It says:
This saw has not had a lot of use in its time. First owner fell 6 trees, the seventh landed on him & k*lled him. Saw tied up in estate for years (not used).
Farmer bought it for son to go scrub cutting. Son said too bloody heavy, got lighter one, gave this one back to his dad (again not used). I got it some years later, used it just for firewood for myself for a few years then decided it was too bloody heavy, got lighter one.
Had it for 40 years. Not used for at least 30 years. Sat in my shed.
Check out more of Tim’s saws which we saw at a agricultural show day, or you can see one of his rarest saws, the McCulloch BP-1.
