DF140 noisy at tickover

Bucksribster · 13 January 2020, 19:09

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:

https://www.youtube.com/watch?v=H6LOYctcU7M

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!

A1an · 13 January 2020, 19:23

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.

Bucksribster · 13 January 2020, 19:32

Quote:

Originally Posted by A1an

what year is the engine?

2005. Just also to say I have checked the manifold core plugs, and they are not corroded.

diver 1 · 13 January 2020, 19:35

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.

diver 1 · 13 January 2020, 19:36

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...?

A1an · 13 January 2020, 19:41

Quote:

Originally Posted by Bucksribster

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.

Bucksribster · 13 January 2020, 21:43

Quote:

Originally Posted by diver 1

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.

Bucksribster · 13 January 2020, 21:45

Quote:

Originally Posted by diver 1

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?