Guest uhav2 Posted March 25, 2015 Share Posted March 25, 2015 I'm in the process of changing the head gasket And was wondering if Im missing a plug here? I am not near the car but don't remember this interconnecting with the water pump. Before I leave work should I be retracing my steps or is this supposed to like this? Link to comment Share on other sites More sharing options...
Guest uhav2 Posted March 25, 2015 Share Posted March 25, 2015 By the way I'm referring to the hole below the thermostat housing. Link to comment Share on other sites More sharing options...
keiser31 Posted March 25, 2015 Share Posted March 25, 2015 What vehicle is it for? Does it have a temperature gauge? Maybe the hole is for the sending unit for the temp. gauge. Link to comment Share on other sites More sharing options...
keiser31 Posted March 25, 2015 Share Posted March 25, 2015 Looks like the temp gauge sending unit goes into the side of the cylinder head....don't know what goes in the other hole. Link to comment Share on other sites More sharing options...
keiser31 Posted March 25, 2015 Share Posted March 25, 2015 I don't see anything coming out the front of the cylinder head, so probably a plug goes in there.... Link to comment Share on other sites More sharing options...
Guest uhav2 Posted March 25, 2015 Share Posted March 25, 2015 It is not the sending unit. It is located right in between the water pump and the head. That's what I was thinking that there should be some kind of plug there?? There seems to be some kind of rubber grommet but there is still a 1/2 inch hole. Link to comment Share on other sites More sharing options...
keiser31 Posted March 25, 2015 Share Posted March 25, 2015 Sounds like a shop manual is in your future or you could scroll down to the "Oldsmobile" section of the forum and ask. Link to comment Share on other sites More sharing options...
Dave Henderson Posted March 25, 2015 Share Posted March 25, 2015 I'm thinking that where the hole is located, the only thing it could be for would be a thermostat bypass to the water pump. Perhaps either your pump or the head has been replaced and they don't match each other. A cutaway '35 through '46 engine view in a period Motors Repair Manual doesn't show a hole there. What does the pump look like there? Link to comment Share on other sites More sharing options...
Guest AlCapone Posted March 25, 2015 Share Posted March 25, 2015 Did we determine year, make and model ? Wayne Link to comment Share on other sites More sharing options...
keiser31 Posted March 25, 2015 Share Posted March 25, 2015 1937 Oldsmobile. Link to comment Share on other sites More sharing options...
Mark Shaw Posted March 25, 2015 Share Posted March 25, 2015 I suggest that it is a bypass connection so when the thermostat is closed the coolant recirculates through the block without going through the radiator. Link to comment Share on other sites More sharing options...
Rusty_OToole Posted March 26, 2015 Share Posted March 26, 2015 Did you take anything out of it? Did you take the head off? When you put the head on, is there an obvious connection to something on the water pump?If the answer to all the above questions is "no" get a pipe plug and some teflon tape and fill the hole before you put the head on. Link to comment Share on other sites More sharing options...
nice ride Posted April 3, 2015 Share Posted April 3, 2015 the hole goes to water pump on 1937 f37 or 6cly. the hole is for water bypass till thermosate opens. Link to comment Share on other sites More sharing options...
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