Engine - Specifications And Service Notes
88yugo01NUMBER: #1-10
DATE: 08/15/88
GVX
DISTRIBUTION: All Service Departments
SUBJECT: 1300cc ENGINE
VEHICLES: All GVX
GENERAL: The 1300 is a larger displacement version of the 1100 engine family, with bigger bore and alightly shorter stroke. It has internal design features which will change parts requirements and/or repair procedures. These include the pistons, rings, pins, connecting rods, crankshaft, and the clutch pressure plate.
COMPARISON: SPECIFICATION 1100 1300
Bore (mm) 80 86.4
Stroke (mm) 55.5 55.375
Displacement (cc) 1116 1298
Compression Ratio 9.2:1 9.1:1
Horsepower @ rpm 52 @ 5000 61 @ 5000
Torque @ rpm 52 @ 4600 65 @ 3000
FEATURES: 1300 engines are "freewheeling" due to redesigned pistons; the valves will not contact the pistons if the camshaft turns independently of the crankshaft. The full-floating wrist pins ride in bushings in the rods. They are retained by Truarc-type circlips in the piston pin bores. 3-piece oil control rings use a segmented expander ring between two scraper rings. The crankshaft has shorter throws, and uses the 1100 flywheel and clutch disc with a heavy duty pressure plate for the Increased torque of the 1300 engine.
PARTS: Unique 1300 parts are designated (31) in the catalog.
SERVICE: Service notes are on the attached page.
1300 ENGINE SERVICE NOTES
RINGS are available in sets, and are supplied with standard or oversize pistons. Ring gaps are .012-.018" on compression rings, .008 to .028" on oil scraper rings, .000" on the Begmented expander ring; do not trim this ring to create end gap, as oil control will be lost.
Single PISTONS with match-fit pins are supplied with rings in the 5 standard bore classes A through E, and piston sets are available in oversizes of 0.2, 0.4, & 0.6 mm (approx. .008, .016, & .024").
PINS can be separated from connecting rods without special equipment; therefore, piston/rod assemblies are not supplied for this engine.
Replacement ROD BUSHINGS are driven into the rods (interference fit) and then reamed to 22 mm+ to fit the pins.
CORRECT PIN FIT will allow the pin to rotate; the pin should slide freely with thumb pressure in both the piston and the rod bushing, but not have any play or clearance that can be felt.