Voici les caractéristiques techniques et autres valeurs importantes pour tout ce qui a trait à la TA22 GT et son moteur le 2T-G
Ces informations ont été collectées et regroupées ici. N'hésitez pas à me contacter sir vous découvrez une erreur, ou si vous avez des infos à ajouter.
La production complète des moteurs 2T à double arbre à cames a commencé en octobre 1970.
Les moteurs étaient produits sur commande spéciale de Toyota, Yamaha fournissant initialement les culasses.
Les moteurs 2T à double arbre à cames de la production peuvent être identifiés grâce aux numéros de moteur : Tous les blocs équipés de la culasse à double arbre à cames avaient des numéros d'identification commençant par 8.
Typiquement, un numéro de moteur 2T/2T-B est 0094490 tandis qu'un 2T-G est 8038332.
- Moteur 2T-G
4 cylindres en ligne, DOHC avec refroidissement liquide
Alésage : 85 mm
Course : 70 mm
Cylindrée : 1'588 cc
Taux de compression : 9.8:1
Puissance : 124 Cv à 6'400 Tours
Couple : 113 Ft/lb à 5'200 tours
Valeur du test des compressions à 250 tours : Valeur idéale : 184.9 lb/sq inch, valeur limite : 163.5 lb/sq inch
Différence de pression maxi entre chaque cylindre : moins de 14.2 lb/sq inch
Valeur de dépression moteur au ralenti : égale ou supérieure à 400 mmHg
Haut moteur :
Segment de compression : 2
Segment racleur : 1
Ouverture de la soupape d'admission (PMH) => 20 degrés (16 degrés depuis avril 1973)
Fermeture de la soupape d'admission (ABDC) => 48 deg (60 deg à partir d'avril 1973)
Ouverture de la soupape d'échappement (BBDC) => 52 deg (60 deg à partir d'avril 1973)
Fermeture de la soupape d'échappement (ATDC) => 16 degrés (16 degrés à partir d'avril 1973)
Carburation : 2 carburateurs Mikuni/Solex de 40 mm PHH doube corps
Régime de ralenti : 850-950 tours
Epaisseur du joint de culasse : 1.5 mm
Cylindres :
Diamètre interne : 80.00 mm à 80.05 mm
Limite d'usure maximale : 0.2 mm
Limite de honage : moins de 0.02 mm
Limite d'ovalisation : moins de 0.02 mm
Limite de d'alésage : 0.05 mm
Soupapes :
Soupape d'admission diamètre . 43 mm ( 44.5 à partir de Avril 1973)
Soupape d'échappement diamètre : 37 mm ( 38.5 mm à partir d'Avril 1973)
Angle de contact des soupapes : 45 degrés
Intake valve overall length (specified) => 106.7mm (106.2mm from April 1973)
Intake valve overall length (limit) => 106.2mm (105.7mm from April 1973)
Exhaust valve overall length (specified) => 105.4mm (105mm from April 1973)
Exhaust valve overall length (limit) => 104.9mm (104.5mm from April 1973)
Valve stem diameter (Intake) => 8.46 - 8.48mm
Valve stem diamter (Exhaust) => 8.45 - 8.46mm
Intake valve stem-to-bushing clearance (specified) => 0.020 - 0.037mm
Intake valve stem-to-bushing clearance (limit) => 0.08mm
Exhaust valve stem-to-bushing clearance (specified) => 0.055 - 0.060mm
Exhaust valve stem-to-bushing clearance (limit) => 0.10mm
Valve head thickness (Intake) => 0.50mm
Valve head thickness (Exhaust) => 0.60mm
Tension des courroies :
Courroie du ventilateur : 8-10mm de jeu avec 10Kg de force
Compresseur de climatisation : 11-14 mm de jeu, avec 10 Kg de force
Liquide de refroidissement :
Capacité totale, environ 6.5 litres
Huile moteur
Capacité totale (avec filtre à huile monté) : 3.8 litres
- Allumage :
Ordre d'allumage : 1-3-4-2
Avance/retard à l'allumage : retard 16 degrés à 800 tours
Jeu au vis platinées : 0.4-0.5 mm
Condensateur : valeur 0.20 - 0.25uF
Valeur d'écartement des électrodes de bougies : 0.7-0.8 mm pour Denso W16EP-G
Attention ! 1 mm sont préconisés pour les bougies Denso W16EX et NGK BP5EZ
Valeur de résistance pour le bobinage primaire de la bobine : 3.3 Ohms
Valeur de résistance pour le bobinage secondaire de la bobine : 8500 Ohms
Valve Clearance - Intake Cold
2T-G => 0.29 - 0.34mm (0.26 - 0.32 mm from April 1973)
Valve Clearance - Intake Hot
2T-G => 0.29 - 0.34mm (0.26 - 0.32 mm from April 1973)
Valve Clearance - Exhaust Cold
2T-G => 0.34 - 0.39mm (0.31 - 0.37 mm from April 1973)
Valve Clearance - Exhaust Hot
2T-G => 0.34 - 0.39mm (0.31 - 0.37 mm from April 1973)
Camshaft Info
2T-G engine
Thrust Clearance (specified) => 0.15 - 0.30mm
Thrust Clearance (limit) => 0.4mm
Bearing Oil Clearance (specified) => 0.030 - 0.067mm
Bearing Oil Clearance (limit) => 0.1mm
Cam Lobe Height (Intake) => 45.87 - 45.97mm (46.37 - 46.47 from April 1973)
Cam Lobe Height (Exhaust) => 45.87 - 45.97mm (46.37 - 46.47 from April 1973)
Cam Lift (Intake) => 9.82mm (10.27mm from April 1973)
Cam Lift (Exhaust) => 9.82mm (10.27 from April 1973)
Camshaft Journal Finished Diameter (No1) => 31.954 - 31.970mm
Camshaft Journal Finished Diameter (No2) => 31.954 - 31.970mm
Camshaft Journal Finished Diameter (No3) => 31.954 - 31.970mm
Camshaft Journal Finished Diameter (No4) => 31.954 - 31.970mm
2T-G engine
Intake valve overall length (specified) => 106.7mm (106.2mm from April 1973)
Intake valve overall length (limit) => 106.2mm (105.7mm from April 1973)
Exhaust valve overall length (specified) => 105.4mm (105mm from April 1973)
Exhaust valve overall length (limit) => 104.9mm (104.5mm from April 1973)
Valve stem diameter (Intake) => 8.46 - 8.48mm
Valve stem diamter (Exhaust) => 8.45 - 8.46mm
Intake valve stem-to-bushing clearance (specified) => 0.020 - 0.037mm
Intake valve stem-to-bushing clearance (limit) => 0.08mm
Exhaust valve stem-to-bushing clearance (specified) => 0.055 - 0.060mm
Exhaust valve stem-to-bushing clearance (limit) => 0.10mm
Valve head thickness (Intake) => 0.50mm
Valve head thickness (Exhaust) => 0.60mm
Contact Valve face angle => 45deg
Valve Guide Bushing Information
2T-G engine
Bushing Inner diameter => 8.51 - 8.52mm
Bushing Outer diameter (Standard) => 14.02 - 14.03mm
Bushing Outer diameter (Oversize) => 14.07 - 14.08m
Bushing replacment temperature => 80deg Cels
Bushing protruded length from cylinder head => Drive in valve guide bushing until snap ring contact with cylinder head.
Valve Spring Information
2T-G engines
Free length => 45.6mm
Installed length => 39.0mm
Spring Installed tension (specified) => 77.2lb (35.0kg)
Spring Installed tension (limit) => 65.0lb (29.5kg)
Squareness limit => 1.6mm
Valve Rocker Shaft Arm
2T-G engines
Valve rocker shaft outer diameter => 15.97 - 15.99mm
Shaft to arm oil clearance => 0.02 - 0.04mm
Valve Lifter
2T-G engine
Outer diameter (Standard) => 237.925 - 37.931mm (Black)
Outer diameter (Standard) => 37.931 - 37.937mm (Blue)
Outer diameter (Standard) => 37.937 - 37.943mm (Yellow)
Outer diameter (Standard) => 37.943 - 37.949mm (Red)
Oil Clearance (specified) => 0.02 - 0.03mm
Oil Clearance (limit) => 0.10mm
Engine Specified Parts Tightening Torque
Crankshaft bearing cap to cylinder block => 7.2 - 8.8 m-kg (52.1 - 63.7 ft-lb)
Connecting rod cap to connecting rod => 4.0 - 5.0 m-kg (28.9 - 36.3 ft-lb)
Camshaft thrust plate to cylinder head => 1.0 - 1.6 m-kg (7.2 - 11.6 ft-lb)
Timing chain cover to cylinder block => 1.0 - 1.6 m-kg (7.2 - 11.6 ft-lb)
Oil pump to cylinder block => 1.7 - 2.6 m-kg (12.3 - 18.8 ft-lb)
Chain tensioner union bolt to cylinder block (2T-G) => 1.0 -1.6 m-kg (7.2 - 11.6 ft-lb)
Crankshaft puller to crankshaft => 4.0 - 6.0 m-kg (28.9 - 43.4 ft-lb)
Cylinder head to cylinder block => 7.2 - 8.8 m-kg (52.1 - 63.7 ft-lb)
Camshaft timing gear to camshaft => 7.0 - 11.0 m-kg (50.6 -79.6 ft-lb)
Valve rocker support to cylinder head => 7.2 - 8.8 m-kg (52.1 - 63.7 lb-ft)
Manifold to cylinder head => 1.0 - 1.6 m-kg (7.2 - 11.6 ft-lb)
Cylinder head cover to cylinder head => 0.4 - 0.7 m-kg (2.9 - 5.1 ft-lb)
Oil pan to cylinder block => 0.5 - 0.8 m-kg (3.6 - 5.8 ft-lb)
Oil pan drain plug to oil pan => 3.0 - 4.0 m-kg (21.7 - 28.9 ft-lb)
Spark plug to cylinder head => 1.5 - 2.1 m-kg (10.9 - 15.2 ft-lb)
Flywheel to crankshaft => 5.8 - 6.6 m-kg (42.0 - 47.7 ft-lb)
Flywheel to crankshaft (2T-G) => 7.7 - 8.3 m-kg (55.7 - 60.0 ft-lb)
Clutch cover to flywheel => 1.5 - 2.0 m-kg (10.9 - 14.5 ft-lb)
Clutch housing to cylinder block => 4.8 - 6.8 m-kg (34.7 - 49.2 ft-lb)
Timing Chain and Timing Gear
2T-G engine
Chain deflection limit (No1) => 13.5mm with 10kg force
Chain deflection limit (No2) => 75.0mm with 10kg force
Vibration damper thickness limit (No 1) => 5.0mm
Vibration damper thickness limit (No 2) => 5.5mm
Vibration damper thickness limit (No 3) => 6.5mm
Tensioner plunger head thickness limit => 7.5mm
Clearance between chain tensioner No1 and chain => 0.5 - 1.0mm
Chain tensioner No2 back stroke => 0.5 - 1.0mm
Crankshaft timing gear wear limit => 60.0mm with chain
Camshaft timing gear wear limit => 114.5mm with chain
Camshaft drive gear & camshaft gear limit => 78.2mm with chain
Clylinder Head
Cylinder Head Warpage Limit => 0.05mm
Valve Seat Contacting Width => 1.4mm
Valve Seat Refacing Angle (Intake & Exhaust) = > 30deg, 45deg, 60deg
Cylinder Block
Cylinder Head Warpage Limit = > 0.05mm
Valve Lift Bore Diameter (standard) => 22.200 - 22.221mm
Valve Lift Bore Diamter (oversize) => 22.250 - 22.271mm
Cylinder
Wear Limit => 0.2mm
Horning Amount = > Less than 0.02mm
Taper, out of round limit = > 0.02mm
Difference of bore between cylinders = > 0.05mm
Piston
Piston Outer Diameter (standard) => 79.94 - 79.99mm
Piston Outer Diameter (oversize) => 84.94 - 84.99mm
Cylinder to Piston clearance => 0.05mm
Piston pin installing temperature => 20deg C
Piston ring end gap (Compression Ring No 1) => 0.2 - 0.4mm
Piston ring end gap (Compression Ring No 2) => 0.1 - 0.3mm
Piston ring to ring groove clearance (Compression RIng No 1) => 0.020 - 0.060mm
Piston ring to ring groove clearance (Compression RIng No 2) => 0.015 - 0.055mm
Piston ring diameter => 22.00 - 22.01mm
Connecting Rod
Connecting Rod Bend limit (per 100mm) => 0.05mm
Connecting Rod Twist limit (per 100mm) => 0.05mm
Big end thrust clearance => 0.16 - 0.26mm
Big end thrust clearance limit => 0.3mm
Bearing oil clearance => 0.024 - 0.048mm
Crankshaft
Bend limit => 0.03mm
Thrust clearance => 0.07 - 0.18mm
Thrust clearance limit => 0.3mm
Taper and out of round limit => 0.3mm
Journal finished diameter (standard) => 57.975 - 58.000mm
Journal oil clearance => 0.032 - 0.056mm
Crankpin finished diameter (standard) => 49.976 - 48.00mm
Crankpin oil clearance => 0.024 - 0.048mm
Flywheel
Run-out limit => 0.1mm
Pression d'huile moteur
Oil temp should be 100 degrees Cels
Oil specification should be SAE No.30
Oil pressure @ idle speed should be more than 0.8kg/cm2 (1.1 psi)
Oil pressure @ 2000rpm should be 3.5 - 4.6kg/cm2 (49.8 - 64.0 psi)
Oil pressure @ 5000rpm should be 4.0 - 5.0kg/cm2 (56.9 - 71.1psi)