The spring force around the check valve is simply enough to help keep oil from draining back again in the sump. As opposed to some other engines that operate them at increased RPMs the 4A-GELU squirter is in constant operation, aiding in cooling and lubrication. from A further forum wrote:Perhaps https://jaidenqufif.blogchaat.com/26774826/5-simple-techniques-for-4age-engine-sale