SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: bills79southwind on July 21, 2013, 01:41:21 PM
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Was hoping to get some help with respect to my Merlin 632 timing cover leak. I re-tightened all of the allen head timing cover bolts and i'm still getting a leak from area in the picture with the red arrow. I was hoping not to have to pull the motor, but I'm not sure I have many options at this point. It's leaking where the red arrow indicates and it runs down the block onto the pan. I'm using Brad Penn 50wt so it's very easy to see. Thanks for any help in advance.
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fi5.photobucket.com%2Falbums%2Fy181%2Fbills04ss%2FIMG_0883use.jpg&hash=8fad305f8cffa8514c651fc306cb2b286460de1d) (http://s5.photobucket.com/user/bills04ss/media/IMG_0883use.jpg.html)
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fi5.photobucket.com%2Falbums%2Fy181%2Fbills04ss%2FIMG_0882.jpg&hash=5069a447add41c958cdde6c46df88db2f2447723) (http://s5.photobucket.com/user/bills04ss/media/IMG_0882.jpg.html)
Bill
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I've never had any success getting a leak like that to seal without removal and proper repair. What are you using for a sealant?
I've had good luck with clean FelPro gaskets and a fresh can of Gasgacinch.
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My builder told me he used Gasgacinch on this as well. I know he does great work and was highly recommended. Stuff happens I know.. I was hoping for a "hog" quick fix for the season out here on the east coast since it's so short as is
Bill
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Don't laugh but I've used a Yamaha dirtbike silicone, called Yamabond, I believe. Ive used it on motor halves on the dirtbikes. Its not silicone based so it wont leak when hit with oil. Very easy to clean also. Pretty much same as Gasgasinch but cheaper. Well it was 2 years ago.
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I could not help but notice the red arrow you added to the picture is between two bolts, this is almost a sure sign of a distorted timing cover.
In my experience when dealing with aluminum on iron, I have always done gaskets the same way, it was taught to me by an airplane mechanic.
He told me when dealing with to completely different materials with a gasket to glue the gasket to the one that will grow the most and use a flexible sealant on the other.
In this case, I would use yellow weatherstrip adhesive affectionately called Gorilla Snot, on the aluminum and RTV on the iron side. These two metals move at different rates and are leak prone when overtightened.
That being said, make sure the bolt holes are a bit larger than the fastener, if they contact each other, a leak is eminent.
Oil leaks suck..... Sweet motor though.. ;)
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I could not help but notice the red arrow you added to the picture is between two bolts, this is almost a sure sign of a distorted timing cover.
In my experience when dealing with aluminum on iron, I have always done gaskets the same way, it was taught to me by an airplane mechanic.
He told me when dealing with to completely different materials with a gasket to glue the gasket to the one that will grow the most and use a flexible sealant on the other.
In this case, I would use yellow weatherstrip adhesive affectionately called Gorilla Snot, on the aluminum and RTV on the iron side. These two metals move at different rates and are leak prone when overtightened.
That being said, make sure the bolt holes are a bit larger than the fastener, if they contact each other, a leak is eminent.
Oil leaks suck..... Sweet motor though.. ;)
Yamahabond is actually some of the best stuff there is! we used it at the Ferrari shop i use to work at. now i swear by it!
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I could not help but notice the red arrow you added to the picture is between two bolts, this is almost a sure sign of a distorted timing cover.
In my experience when dealing with aluminum on iron, I have always done gaskets the same way, it was taught to me by an airplane mechanic.
He told me when dealing with to completely different materials with a gasket to glue the gasket to the one that will grow the most and use a flexible sealant on the other.
In this case, I would use yellow weatherstrip adhesive affectionately called Gorilla Snot, on the aluminum and RTV on the iron side. These two metals move at different rates and are leak prone when overtightened.
That being said, make sure the bolt holes are a bit larger than the fastener, if they contact each other, a leak is eminent.
Oil leaks suck..... Sweet motor though.. ;)
Thanks for the response GT. So do you have recommendation on a good aluminum timing cover? I've hears pro's and con's to 2 piece covers, but at this point, I just want to stop the leaking. I can't stand any large amount of oil in my bilge. Overall, I'm very happy with the motor. However, I still haven't got a full WOT run as i'm working this issue. :banghead:
Bill