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Piston ring kit Std. 4 Piston ring grooves GM 1097250. 1939-40

2 850 kr

ATTENTION! These piston rings only fit Cadillac original pistons with 4 piston ring grooves per piston and Standard cylinder diameter.

SKU: MOT-7250-1 Enhet: clause

Generally

A complete piston ring set in original design for 1 engine. ATTENTION! These piston rings only fit Cadillac original pistons with 4 piston ring grooves per piston. And with standard cylinder diameter. We have different makes of these "Made in US" piston rings and deliver what we have in stock at the moment. They replace Cadillac original number GM 1097250. A set thus contains all piston rings for an engine that has 4 piston ring grooves on each piston and the following models and model years. 1939 Series. 60S, 61 and 75. 1940 Series 60S, 62,72 and 75

Tip!

Before installing the piston rings on the piston, slide the piston rings into the cylinder bore one at a time using a plunger so that they come straight. Check that the end gap is the same on all rings. If you want to measure the end gap use a blade gauge, the Cadillac workshop manuals say there should be an end gap of at least 0.33mm. The max end gap according to Cadillac is 0.73mm, if the gap is bigger it means you get a little worse compression, if the gap is less than 0.33mm then something is wrong.
In order to get a good contact surface between the cylinder bores and the piston rings, these must be worn against each other.
The cylinder wall must be cross-honed (slightly roughened surface) when fitting new piston rings. The tops of this surface are cut down by the piston rings during run-in. In order to get a good seal between the ring and the cylinder wall, you have to create a proper cylinder pressure so that the entire circumference of the piston ring is forced out against the cylinder wall.
When you have refurbished the engine, do not let it idle. Let the engine run at a slightly higher speed for the first half hour and you will get better speed of the oil pump and water pump, thus better lubrication and cooling. Load it a little at regular intervals and you will get a higher pressure behind the piston rings and break-in will be easier.