1942 - 1947 Chevrolet Shop Manual



	*6-30*

		available for service under part No. 6C2799. To install this spring, rotate the valve weight toward engine to the "Heat Off" position, then insert the anti-rattle spring in slot "A," Fig. 66. In some cases it may be necessary to adjust this spring when installing. Hold the weight on the manifold heat valve shaft 3/16" above the "Heat On" position and bend the spring until it just touches the stop pin "B," Fig. 66.
		ENGINE MOUNTINGS Cushion balanced engine mountings are used to prevent even the smallest amount of engine vibration being transmitted to the passengers in the car or truck. To adjust the engine mountings, proceed as follows: 1. Tighten the front engine mounting bolts. Should the mounting or mountings be oil soaked replacement should be made. 2. Tighten the rear engine mounting bolts at the rear of the transmission (passenger models only). Make sure the mounting studs are tight in the transmission case. 3. Check the clearance between the transmission cross member and the "U" section plate (passenger models only). This clearance should he from .005" to .015", equally spaced fore and aft. If the clearance exceeds these limits, remove the mounting and bend the "U" section plate until the clearance is within the above limits. NOTE—This clearance is very important, because it limits the fore and aft movement of the engine. 4. (On trucks) Tighten the side engine mounting bracket bolts. 5. (On passenger models) Remove the bolts from the engine side mountings and check the clearance between the mounting and its bracket on each side, if the clearance is more than 1/16", shim with 3/8" plain flat washer. If the clearance is less than 1/16", loosen the bracket bolts and push the mounting upward. (There may be sufficient clearance in the bracket bolt holes to give the necessary 1/16" clearance). If unable to get the proper clearance in the manner mentioned above, remove the brackets and elongate the holes with a round file until the 1/16" clearance between the mounting and the bracket is obtained. NOTE—It is important that these mountings be set up with an equal amount of tension on each side.
	Fig. 65-Manifold Heat Riser and Heat Control Valve with the result that the incoming gases will be expanded several times greater than normal and it will be impossible to get a normal full charge into the cylinders. This, of course, reduces power and maximum speed, makes the car lazy on acceleration, etc. Such overheating may also cause detonation as well as sticking valves. Therefore, it is most important that the thermostatic spring be wound up just enough to slip the end over the anchor pin in the manifold and no more. This is approximately 1/2 turn of the spring from its position when unhooked. Whenever the manifolds are removed from an engine, the gaskets should be examined to be sure they are in good condition, as leaky gaskets will cause the engine to miss. Worn gaskets should be replaced with new. In assembling the manifolds to the cylinder head, the bolts should be drawn up evenly until they are all tight. A special wrench is necessary to properly tighten these bolts. Exhaust Manifold Valve Anti-Rattle Spring An anti-rattle spring for use on the exhaust manifold valve shaft in case a rattle develops is

	Fig. 66-Manifold Heat Valve Anti-Rattle Spring