525 question
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525 question
I was told today a mercruiser 525 with about 300 hours is gonna need extensive top end work soon due to that many hours on the motor. Is this true? I was told lifters will start to fail ect. What doesn't make sense is a 502 in a car can last over 100000 miles but this will only last 300 hrs. Motor has never been beat on easy take offs not run at wot for excessive periods. Thoughts????
#2
You have to take in consideration. The rpms that boat motors run At for long periods of time. And let alone the amount of load there at unlike a car that can roll down the road, is a lot less load on a motor.
Emagine driving ur car how often do u run ur car motor at 5000 rpms and how long not very maybe a few seconds. I'm not an expert or nothing but that's just what I have learned.
Emagine driving ur car how often do u run ur car motor at 5000 rpms and how long not very maybe a few seconds. I'm not an expert or nothing but that's just what I have learned.
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I was told today a mercruiser 525 with about 300 hours is gonna need extensive top end work soon due to that many hours on the motor. Is this true? I was told lifters will start to fail ect. What doesn't make sense is a 502 in a car can last over 100000 miles but this will only last 300 hrs. Motor has never been beat on easy take offs not run at wot for excessive periods. Thoughts????
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Just think of it this way. how long will your car (say with a 502) last if you drive it all the time in first gear, going 65- 70 MPH on the highway at 4000- 4500 RPM's. This is cruising. Now hit the paddle, red line it (or close) for a while, say an hour. and I wonder if you make it home. Pretty much a typical boat ride.
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Just think of it this way. how long will your car (say with a 502) last if you drive it all the time in first gear, going 65- 70 MPH on the highway at 4000- 4500 RPM's. This is cruising. Now hit the paddle, red line it (or close) for a while, say an hour. and I wonder if you make it home. Pretty much a typical boat ride.
#9
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I was told today a mercruiser 525 with about 300 hours is gonna need extensive top end work soon due to that many hours on the motor. Is this true? I was told lifters will start to fail ect. What doesn't make sense is a 502 in a car can last over 100000 miles but this will only last 300 hrs. Motor has never been beat on easy take offs not run at wot for excessive periods. Thoughts????
The lift and duration on the 525 is pretty hard on everything compared to a "Car". Those pesky leak prone CMI's should be checked as well.
Have the top ends done. Change the starters, impeller housings, and go boating for another 300 hrs with peace of mind