Hello. We have a situation; our Atomic 4 does not warm up... it starts at 100 and the needle rises a just bit when running hard. Here is what I have done so far
1) the original Holley t-stat was removed and tested. It starts opening at 152 and is completely open at 173 (it’s great to have access to lab equipment!).
2) I can force the temp higher by partially closing the raw water intake
3) I can not find any leaks in the system.
4) I have check and played around with the timing and it does not seem to have an effect
4) I tried to ohm out the temp sensor but I could not get a consistent reading. This was done 2 ways, one with the raw water wide open and once with the raw water partially closed. In both cases I could not get a reading. I suspect that is done to user error because the gauge will rise when the water flow is closed.
5) a new manifold was installed a couple of years ago and the issue seems to coincide with that repair.
6) all hoses are new with the mainifold repair
7) the amount of water exiting the boat with the exhaust appears normal, ie no changes
8) a new MM carburetor was installed (long story for another time!)
The engine runs fine... a bit rich sometimes.
Any ideas?
Thank you,
Larry
‘79 Tartan 30
1) the original Holley t-stat was removed and tested. It starts opening at 152 and is completely open at 173 (it’s great to have access to lab equipment!).
2) I can force the temp higher by partially closing the raw water intake
3) I can not find any leaks in the system.
4) I have check and played around with the timing and it does not seem to have an effect
4) I tried to ohm out the temp sensor but I could not get a consistent reading. This was done 2 ways, one with the raw water wide open and once with the raw water partially closed. In both cases I could not get a reading. I suspect that is done to user error because the gauge will rise when the water flow is closed.
5) a new manifold was installed a couple of years ago and the issue seems to coincide with that repair.
6) all hoses are new with the mainifold repair
7) the amount of water exiting the boat with the exhaust appears normal, ie no changes
8) a new MM carburetor was installed (long story for another time!)
The engine runs fine... a bit rich sometimes.
Any ideas?
Thank you,
Larry
‘79 Tartan 30
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