tilynb61 Posted May 19, 2019 Share Posted May 19, 2019 My 63 Thermodyne on start up takes a good 20 seconds or more to show pressure on the guage. After that holds 30 lbs at idle . Has the remote filter housing, full flow I believe. 3 lines to it. Is there a check valve not working possibly? Or just the way they are? This is with 15 40 oil, 60 degrees outside. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/57286-63-b61-thermodyne-slow-to-build-oil-pressure/ Share on other sites More sharing options...
j hancock Posted May 20, 2019 Share Posted May 20, 2019 That is a little slow but I have seen worse. When did you last change the oil? Do you have the screen in the bottom of the pan and did you clean it? The screen is behind the 8" diameter cover if so equipped. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/57286-63-b61-thermodyne-slow-to-build-oil-pressure/#findComment-423192 Share on other sites More sharing options...
Freightrain Posted May 20, 2019 Share Posted May 20, 2019 (edited) Mine was the same forever. Tried bleeding it, polished the check valves. Nothing made it better. Such is life. Only got better when I put spin on filters. Edited May 20, 2019 by Freightrain Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/57286-63-b61-thermodyne-slow-to-build-oil-pressure/#findComment-423206 Share on other sites More sharing options...
tilynb61 Posted May 20, 2019 Author Share Posted May 20, 2019 I have not checked the screen. If it has one I will take a look. I've thought of going to spin on filters, I will have to look into what is involved in changing over. Quote Link to comment https://www.bigmacktrucks.com/topic/57286-63-b61-thermodyne-slow-to-build-oil-pressure/#findComment-423229 Share on other sites More sharing options...
theakerstwo Posted May 20, 2019 Share Posted May 20, 2019 There is a check valve in one of the fittings at the bottom of the filter. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/57286-63-b61-thermodyne-slow-to-build-oil-pressure/#findComment-423233 Share on other sites More sharing options...
1965 Posted May 20, 2019 Share Posted May 20, 2019 I was thinking some of the older trucks & equipment had some sort of a restricted fitting in them. Made it slow to show pressure? Maybe put a manual gauge in the hole & just make sure? Quote Link to comment https://www.bigmacktrucks.com/topic/57286-63-b61-thermodyne-slow-to-build-oil-pressure/#findComment-423234 Share on other sites More sharing options...
fuzzy buzzard Posted May 21, 2019 Share Posted May 21, 2019 I had same problem with the B67. Turned out the filter housing was draining - valve not sealing. Worked a bunch on valve, changed valve, no good. Sit for week and housing would be close to empty. 3 ball valves and I cured that problem - just as long as I remembered to open valves before starting. It was a crude cure but work life was full and didn't have time then to tinker a whole lot. Quote Link to comment https://www.bigmacktrucks.com/topic/57286-63-b61-thermodyne-slow-to-build-oil-pressure/#findComment-423244 Share on other sites More sharing options...
Rob Posted May 21, 2019 Share Posted May 21, 2019 Common problem in the old style canister type filters whether full, or bypass flow. A replacement external check valve with a very low pressure unseating pressure and viton seat takes care of the issue. Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/57286-63-b61-thermodyne-slow-to-build-oil-pressure/#findComment-423254 Share on other sites More sharing options...
Freightrain Posted May 21, 2019 Share Posted May 21, 2019 (edited) 12 hours ago, tilynb61 said: I have not checked the screen. If it has one I will take a look. I've thought of going to spin on filters, I will have to look into what is involved in changing over. Do you have turbo? Oil cooler? If so, then any 237 filter arrangement should bolt on. If you don't have turbo and/or oil cooler, then it will be tougher to find a spin on set up for it. I was lucky to get mine years back, as mine didn't have turbo/cooler. I pulled my valves apart, polished all the seats and it worked better for like a day. Then back to draining. Edited May 21, 2019 by Freightrain Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/57286-63-b61-thermodyne-slow-to-build-oil-pressure/#findComment-423266 Share on other sites More sharing options...
Swishy Posted May 21, 2019 Share Posted May 21, 2019 if it takes a while to sho pressure ....... how long does it take to loose all the pressure in gauge when shut down leaning towards a gummd up tube th@ needs flush n out betweeb gauge n block etc cya Quote Link to comment https://www.bigmacktrucks.com/topic/57286-63-b61-thermodyne-slow-to-build-oil-pressure/#findComment-423310 Share on other sites More sharing options...
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