Camusus Posted March 15, 2021 Share Posted March 15, 2021 Good day everybody, I recently adjusted the intake (.008") and exhaust (.012") valves (replaced valve cover gasket, half moons, and grommets as well) on my 1983 22R 4spd manual 2wd Toyota dolphin and have noticed that after warming up the engine and driving it for 5-10 minutes the engine temperature gauge increases to about half way for 30-90 seconds and then decreases to "normal" operating temp at ~1/4 on the gauge. This was not happening prior to the adjustment. Has anyone observed this before or have any insight into the cause of this? I have not driven it farther than 15 miles at a time, or in hilly terrain after the valve adjustment, and therefore dont know how the engine temp will respond to more strenuous driving conditions. thanks, camusus Quote Link to comment Share on other sites More sharing options...
WME Posted March 15, 2021 Share Posted March 15, 2021 Adjusting the valves most likely have nothing to do with the temp spike. Toyota 22R/RE are famous for this. In fact Toyota came out with factory 2 step thermostat to help prevent it...https://www.ebay.com/itm/301963137682?chn=ps&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=301963137682&targetid=1068323858830&device=c&mktype=pla&googleloc=9029305&poi=&campaignid=10459841979&mkgroupid=104612009460&rlsatarget=pla-1068323858830&abcId=2146002&merchantid=101653519&gclid=EAIaIQobChMIzq6I2qCz7wIVBAutBh2HMwjcEAQYAiABEgIn8PD_BwE Quote Link to comment Share on other sites More sharing options...
Camusus Posted March 16, 2021 Author Share Posted March 16, 2021 Well i’ll be darned. Thanks for the info and the link— i’ll be looking into this to learn some more about the engine.. Quote Link to comment Share on other sites More sharing options...
Maineah Posted March 17, 2021 Share Posted March 17, 2021 No relationship to valve adjustment unless it runs poorly after you adjusted them. Quote Link to comment Share on other sites More sharing options...
Camusus Posted March 18, 2021 Author Share Posted March 18, 2021 heard. it's been running well. i ordered a two stage thermostat and in the meantime i'll keep an eye on it. thanks. Quote Link to comment Share on other sites More sharing options...
Scott iv Posted March 18, 2021 Share Posted March 18, 2021 OEM 2 stage thermostat is a good way to go. There are some cheap skates out here (myself being one) who have been using the $4-$8 aftermarket thermostat with a drill hole for years without issue. Controversial and I may get lectured for mentioning it. Quote Link to comment Share on other sites More sharing options...
Camusus Posted March 18, 2021 Author Share Posted March 18, 2021 i read about that fix, glad to hear it's working for you. Quote Link to comment Share on other sites More sharing options...
Camusus Posted April 12, 2021 Author Share Posted April 12, 2021 here's an update on the two stage thermostat replacement: after 200 or so miles of city driving and then about 1300 miles driving from new mexico to arkansas- up and down hills to the river and back-the engine temp spike has become a non issue. problem solved! also, ive noticed that the valve adjustment gave some new power into the engine (if thats even possible). the mushroom mobile can drive through hilly countryat 50-55mph in 4th gear with a higher rpm than pre-adjustment. at least, thats been my observation. alls well and approaching 10,000 miles on the dolphin. cheers. Quote Link to comment Share on other sites More sharing options...
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