higer oil temp after rebuild, bypass??
06-30-2014, 09:20 AM
#1
higer oil temp after rebuild, bypass??
Have a friend with twin 500EFIs. One was rebuild top to bottom this past winter, the other got a top end fresh. Now oil temp is 50+ degrees different, not off the charts but different. He is running in real cold water (Great Lakes) 52 degrees. Oil temps on hot engine runs 190 to 230 and climbing when running hard. Cool engine 150 to 180 running hard. Water temp is exactly the same, exactly. He is concerned that later in the year, doing runs on warming water will give him serious issues with hot oil. I don't want to debate how hot oil can get, just want these engines to match as they used to.
A while back I read something on here about a bypass that has to be reinstalled on marine engines where the engine block filter housing would be? I searched but can not find it. Can someone explain what this is? Is there a chance the builder left it out? Can it be installed with engine in the boat or is it internal?
Thanks
A while back I read something on here about a bypass that has to be reinstalled on marine engines where the engine block filter housing would be? I searched but can not find it. Can someone explain what this is? Is there a chance the builder left it out? Can it be installed with engine in the boat or is it internal?
Thanks
06-30-2014, 09:42 AM
#2
Registered
iTrader: (3)
when the rebuild wes done was the origional bypass used and what kind of oil temp did he see before the rebuild?i would suggest checking the grounds at the dash and replacing the oil temp sending unit ,the oil temp might not be as hot as the gage sais it is.
06-30-2014, 09:43 AM
#3
http://www.offshoreonly.com/forums/g...-hardware.html
The bypass you are referring to is a 30lb unit that replaces the 11 Lb many of the truck engines come with. If he has the two 11 lb bypass valves installed in the filter block on that one engine that could very well be the issue.
The proper way is to remove the middle bypass valve leaving it open, then either install a 30lb valve or placing a plug in the inboard hole closest to the pan rail side.
http://www.ebay.com/itm/390855596324
Installing the 30lb valve is my preference.
The bypass you are referring to is a 30lb unit that replaces the 11 Lb many of the truck engines come with. If he has the two 11 lb bypass valves installed in the filter block on that one engine that could very well be the issue.
The proper way is to remove the middle bypass valve leaving it open, then either install a 30lb valve or placing a plug in the inboard hole closest to the pan rail side.
http://www.ebay.com/itm/390855596324
Installing the 30lb valve is my preference.
That is good info, thank you.
Still wondering what a builder may have changed or left out however. The engine was rebuilt as stock, to match the other one.
06-30-2014, 10:48 AM
#4
Registered
Join Date: Nov 2011
Location: n.y.
Posts: 80
Likes: 0
Received 0 Likes
on
0 Posts
http://www.offshoreonly.com/forums/g...-hardware.html
The bypass you are referring to is a 30lb unit that replaces the 11 Lb many of the truck engines come with. If he has the two 11 lb bypass valves installed in the filter block on that one engine that could very well be the issue.
The proper way is to remove the middle bypass valve leaving it open, then either install a 30lb valve or placing a plug in the inboard hole closest to the pan rail side.
http://www.ebay.com/itm/390855596324
Installing the 30lb valve is my preference.
The bypass you are referring to is a 30lb unit that replaces the 11 Lb many of the truck engines come with. If he has the two 11 lb bypass valves installed in the filter block on that one engine that could very well be the issue.
The proper way is to remove the middle bypass valve leaving it open, then either install a 30lb valve or placing a plug in the inboard hole closest to the pan rail side.
http://www.ebay.com/itm/390855596324
Installing the 30lb valve is my preference.
if i remove the 11lb valve and install the 30lb valve do i have to plug the inboard hole thanks rod
07-01-2014, 02:52 PM
#10
Banned
iTrader: (9)
Totally agree with what Borgie is saying here and especially about the Schumman oil pumps as they do oil pumps all day long. They also are doing some cool stuff for oil pumps on the LS engines as well.
I took a class that they put on last year and it was very informative as to how they are improving stock oil pumps along with some of their own designs. A lot of info about internal pressure spikes within the oil pump itself that want to combat. Anyways they have been around a very long time.
I took a class that they put on last year and it was very informative as to how they are improving stock oil pumps along with some of their own designs. A lot of info about internal pressure spikes within the oil pump itself that want to combat. Anyways they have been around a very long time.
