10.1.6. Camshaft and its drive


Fig. 10-9. Scheme of the drive of the camshaft: 1 — a pulley of a bent shaft; 2 — a generator drive belt; 3 — the lower protective cover; 4 — the cogged pulley of a bent shaft; 5 — an average protective cover; 6 — bolts of fastening of an arm of a tension roller; 7 — a tension roller; 8 — the top protective cover; 9 — a camshaft pulley; 10 — a gear belt; 11 — an arm of a tension roller; 12 — an arm spring; 13 — a pulley of the roller of the drive of the oil pump; And — a tag on the cogged pulley of a bent shaft; In, D — VMT tags on a camshaft drive cover; With — a tag on a pulley of a bent shaft; Е — a tag on a cover of a head of cylinders; F — a tag on a camshaft pulley

Adjustment of a tension of a belt. Remove the top protective cover of 8 (fig. 10-9).
Weaken bolts of the 6th fastening of an arm of the 11th tension roller and turn a bent shaft on two-three turns in the direction of rotation. At the same time the spring 12 will automatically establish a necessary tension of a belt 10. Rotate a shaft smoothly, keeping a belt in a constant tension and not allowing weakening of a belt at a shaft stop.
Tighten bolts 6 and fix the top protective cover 8.
Replacement of a belt of the drive of the camshaft. Take off a belt 2 drives of the generator and the top protective cover 8.
Turn a bent shaft and combine a tag With on a pulley of 1 bent shaft with a tag of D (в.м.т.) on an average protective cover 5, and F tag on a pulley of the 9th camshaft — with a tag E on a cover of a head of cylinders.
Remove average 5 and the lower 3 protective covers. Remove a spring 12, weaken bolts 6, take away an arm of the 11th tension roller in extreme left situation and take off a belt 10.
Get a new belt for a pulley 1, put on the cogged pulley 4 of a bent shaft and, pulling a belt, put on it a pulley of the 13th roller of the drive of the oil pump and a pulley of the 9th camshaft.
Put on a belt a tension roller 7, draw in an arm 11 to the right and establish a spring 12. Smoothly turn a bent shaft on two turns, keeping a belt in a constant tension and not weakening it at a shaft stop. Tighten bolts 6.
Check coincidence of tags of E, F and tags of C and D. If tags do not coincide, repeat installation of a belt.
Establish protective covers 3, 5 and 8, put on a belt of the drive of the generator and pull it. Check and if necessary adjust installation of the moment of ignition.
Check of technical condition of a belt. The surface of a gear part has to be with an accurate profile of teeths, without folds, cracks, undercuts and peelings of fabric from rubber.
On face surfaces stratification and a razlokhmachivaniye should not be observed, but the insignificant vystupaniye of a fringe of fabric is allowed.
The surface of an external flat part has to be equal, without folds, cracks, deepenings and cambers.
Check of the mechanism of a tension of a belt. The working surface of a tension roller has to be smooth, without забоин and agnails.
The ball bearing of a tension roller has to rotate smoothly, without jammings.

Fig. 10-10. A specification for check of a tension spring

Elasticity of a tension spring has to is in the limits specified fig. 10-10. At smaller elasticity replace a spring.
Assembly of the case of bearings of the camshaft. Fix the case of bearings of the camshaft on the device for assembly.
Oil basic necks and cams of the camshaft for the engine and install it in the case of bearings.
Attach to the case of bearings a persistent flange and the holder with an epiploon, without tightening a fastening nut.

Fig. 10-11. Installation of the holder of an epiploon of the camshaft: And – the lower plane of the holder; In – the lower plane of the case of bearings of the camshaft

Establish a mandrel 67.7853.9548 for centering of the holder of an epiploon concerning the camshaft and, pressing the holder of an epiploon to adaptation emphasis, tighten nuts of fastening of the holder. At the same time not parallelism no more than 0,15 mm of the lower plane A (fig. 10-11) of the holder of rather lower plane In cases of bearings of the camshaft will be sustained.
Remove a mandrel and attach a pulley to the camshaft, without tightening a fastening bolt.

       NOTE
It is necessary to check installation of a float always when replacing a float or the needle valve; in the latter case it is necessary to replace also sealing laying of the valve.