steeler Posted March 8, 2022 Share Posted March 8, 2022 2016 GU. What in the world is going on here! Piston oil thermo valve won't come out without stripping down half the engine? Or does someone have a trick? Quote Link to comment https://www.bigmacktrucks.com/topic/69342-oil-thermostat-replacement/ Share on other sites More sharing options...
Joey Mack Posted March 8, 2022 Share Posted March 8, 2022 (edited) are you trying to replace the plunger in the piston cooling tube control, under the right side of the engine? jojo Edited March 8, 2022 by Joey Mack Poor spelling Quote Link to comment https://www.bigmacktrucks.com/topic/69342-oil-thermostat-replacement/#findComment-491220 Share on other sites More sharing options...
steeler Posted March 8, 2022 Author Share Posted March 8, 2022 5 minutes ago, Joey Mack said: are you trying to replace the plunger in the piston cooling tube control, under the right side of the engine? jojo Yes, mp7, in the front of the oil filter housing. Quote Link to comment https://www.bigmacktrucks.com/topic/69342-oil-thermostat-replacement/#findComment-491222 Share on other sites More sharing options...
Joey Mack Posted March 8, 2022 Share Posted March 8, 2022 those pull out. I dont remember having to take a bunch of stuff off the engine, however, I did this repair on MP-8's.. I may not be of any help, sorry bud. I should have waited to post... Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/69342-oil-thermostat-replacement/#findComment-491225 Share on other sites More sharing options...
steeler Posted March 8, 2022 Author Share Posted March 8, 2022 Yeah this one is hitting a hump in the block where an oil pan bolt threads in. Barely, but enough that the valve will not drop down far enough. I found a service bulletin for the leu, which states to remove turbo, egr cooler, then filter head. Only other option in seeing here is to gently shave that oil pan boss on the block enough to get it out. 31 minutes ago, Joey Mack said: Quote Link to comment https://www.bigmacktrucks.com/topic/69342-oil-thermostat-replacement/#findComment-491231 Share on other sites More sharing options...
Onyx610 Posted March 8, 2022 Share Posted March 8, 2022 Jack the engine up, your engine mount could be bad. Quote Link to comment https://www.bigmacktrucks.com/topic/69342-oil-thermostat-replacement/#findComment-491235 Share on other sites More sharing options...
steeler Posted March 8, 2022 Author Share Posted March 8, 2022 15 minutes ago, Onyx610 said: Jack the engine up, your engine mount could be bad. Its hitting the engine block. Otherwise no clearance issues. Apparently this isn't an issue with the 07 emissions, only after 10 I think. Quote Link to comment https://www.bigmacktrucks.com/topic/69342-oil-thermostat-replacement/#findComment-491236 Share on other sites More sharing options...
Onyx610 Posted March 8, 2022 Share Posted March 8, 2022 Ohh ok, I guess you have to take the filter housing off. So dumb… Quote Link to comment https://www.bigmacktrucks.com/topic/69342-oil-thermostat-replacement/#findComment-491237 Share on other sites More sharing options...
Mackpro Posted March 8, 2022 Share Posted March 8, 2022 Replaced lots and lots of the oil thermostats on MP7 and MP8’s. But never replaced the piston cooling thermostats that comes in from the bottom. Sometimes the oil cooler thermostat shorts out and also sets a code for the piston cooling thermostat because the share some of the same wiring, I know the newer common rail trucks we have , have a separate fuse just for both of the thermostats. And by thermostats I mean solenoid’s. I’m actually replacing a oil thermostat in a 2015 MP 8 today 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69342-oil-thermostat-replacement/#findComment-491243 Share on other sites More sharing options...
steeler Posted March 8, 2022 Author Share Posted March 8, 2022 16 minutes ago, Mackpro said: Replaced lots and lots of the oil thermostats on MP7 and MP8’s. But never replaced the piston cooling thermostats that comes in from the bottom. Sometimes the oil cooler thermostat shorts out and also sets a code for the piston cooling thermostat because the share some of the same wiring, I know the newer common rail trucks we have , have a separate fuse just for both of the thermostats. And by thermostats I mean solenoid’s. I’m actually replacing a oil thermostat in a 2015 MP 8 today That's what I've normally seen as well. I didn't get so lucky this time. This one is actually causing the red shutdown light. I plugged in a new thermostat and the code goes away. Had a guy at our local dealer tell me that mack says to remove the filter head, but he's been able to get them out without doing that. If I have to do some block shaving, then shaving I will do! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69342-oil-thermostat-replacement/#findComment-491245 Share on other sites More sharing options...
Popular Post steeler Posted March 8, 2022 Author Popular Post Share Posted March 8, 2022 Shaving the block is the trick. Doesn't take a lot, but I had to shave it all the way to where the block meets the oil pan gasket. Was able to wiggle it out after that. Thanks for the comments guys! 4 Quote Link to comment https://www.bigmacktrucks.com/topic/69342-oil-thermostat-replacement/#findComment-491255 Share on other sites More sharing options...
Onyx610 Posted March 8, 2022 Share Posted March 8, 2022 Thanks for letting us know! Quote Link to comment https://www.bigmacktrucks.com/topic/69342-oil-thermostat-replacement/#findComment-491256 Share on other sites More sharing options...
steeler Posted March 8, 2022 Author Share Posted March 8, 2022 13 minutes ago, Onyx610 said: Thanks for letting us know! Always! I've been working on mack engines for almost 30 years, used to be the easiest but Volvo has really done some head scratching engineering. Maybe at the top of the list, well Paccar is right up there with them. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69342-oil-thermostat-replacement/#findComment-491262 Share on other sites More sharing options...
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