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Old 13 January 2020, 15:09   #1
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DF140 noisy at tickover

Looking for some advice. My 2005 Suzuki DF140 has become quite noisy at tickover. it is an exhaust noise, and does not become worse with increased revs - see a vid here:

There is some sort of exhaust port just along side the cooling water tell-tail - see photo. At tickover there seems to be exhaust coming out of it, and not much exhaust underwater. Is there meant to be a bung in this port? If anyone else has a DF 140 and could take a photo of the port on theirs, it would also be appreciated. Thanks!
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Old 13 January 2020, 15:23   #2
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there is usually a plug in there. if you block the hole with something does the ticking stop?


There is a port/plug on the exhaust that has a habit of corroding out, I think it may have been cured by 2005.
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Old 13 January 2020, 15:32   #3
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what year is the engine?


2005. Just also to say I have checked the manifold core plugs, and they are not corroded.
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Old 13 January 2020, 15:35   #4
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Hi I have a 2002 DF140 same as yours. Shouldnt be a bung in that exhaust port. Few checks I would do - 1st of all check the engine oil is it milky / emulsified? Is it the correct level? Sounds ok when your revs increase. Does it run ok at tickover other than the noise? I got a cylinder head problem with mine and ended up getting a newer cylinder head from a 2010 engine. Much better (revised about 9 times over the years by Suzuki) design.
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Old 13 January 2020, 15:36   #5
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I had corrosion through the side wall of an inlet valve chamber, don't want to alarm you but you could have corrosion though and exhaust valve chamber...?
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Old 13 January 2020, 15:41   #6
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Quote:
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2005. Just also to say I have checked the manifold core plugs, and they are not corroded.
Yeah sorry, I missed the year in the original post.
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Old 13 January 2020, 17:43   #7
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Quote:
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Hi I have a 2002 DF140 same as yours. Shouldnt be a bung in that exhaust port. Few checks I would do - 1st of all check the engine oil is it milky / emulsified? Is it the correct level? Sounds ok when your revs increase. Does it run ok at tickover other than the noise? I got a cylinder head problem with mine and ended up getting a newer cylinder head from a 2010 engine. Much better (revised about 9 times over the years by Suzuki) design.
I have not noticed emulsified oil, but I will re-check when I get back to it (probably the weekend). The engine runs fine all through the rev range, including tick-over. It is just makes more noise at tick-over than it used to.
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Old 13 January 2020, 17:45   #8
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I had corrosion through the side wall of an inlet valve chamber, don't want to alarm you but you could have corrosion though and exhaust valve chamber...?
Yikes! What symptoms would I see from this do you think?
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