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Suzuki Outboard - NO COMPRESSION ON 3 CYLINDERS - 900h - 5 years old  Rate Topic 
 
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 Posted: Mon Apr 1st, 2019 10:40 am
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ricardoliveira
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Mana: 
Hi Guys,

Just wanted to know your opinion about what happened to my Suzuki Engines last week.

How can a 5year old(one owner), 900h engine have no compression on the 3 cylinders. Using it not commercially but as a weekend boat?
When all the services where made in time and the engines were really well taken care of.

Here a video with a more detailed explanation of what happened. Includes pictures of the engines and videos.
https://www.youtube.com/watch?v=anNYTuH1hSU

Please let me know if you have ever heard of new engines doing this and your opinions and questions.

Thanks so much
Regards
Ricky

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 Posted: Mon Apr 1st, 2019 02:19 pm
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benniejordaan
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Mana: 
Generally speaking, Suzuki is at the top right now in terms of quality. All commercials are now fitting Suzuki. Would like to see the outcome, keep us posted.

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 Posted: Mon Apr 1st, 2019 05:34 pm
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pork pie
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salt in intake manifold?

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 Posted: Mon Apr 1st, 2019 05:46 pm
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willem wikkel spies
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Mana: 
well it is a 3x cylinder engine.
no compression on all 3x cylinders is not commonly found.

if head gasket went, one should still have compression on other cylinders, unless it over heated.

oil is not grey so does not look like it mixed with water.
if it was a valve, then only the affected cylinder would not have compression.

so, what went wrong?
plastic bag over gearbox which starved engine of water?
which caused a overheating situation?

without you knowing it overheated?
had it once in Durban, lucky for me, the buzzer went off.
could not understand at first but found the bag.
lucky no damage to engine, this was 5x years back already.

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 Posted: Mon Apr 1st, 2019 05:51 pm
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ricardoliveira
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pork pie wrote:
salt in intake manifold?

Yeah, I guess it must be from the Sea spray when engines are on the go. Must be the airflow. I guess the environment is ruff.

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 Posted: Mon Apr 1st, 2019 06:11 pm
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ricardoliveira
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willem wikkel spies wrote:
well it is a 3x cylinder engine.
no compression on all 3x cylinders is not commonly found.

if head gasket went, one should still have compression on other cylinders, unless it over heated.

oil is not grey so does not look like it mixed with water.
if it was a valve, then only the affected cylinder would not have compression.

so, what went wrong?
plastic bag over gearbox which starved engine of water?
which caused a overheating situation?

without you knowing it overheated?
had it once in Durban, lucky for me, the buzzer went off.
could not understand at first but found the bag.
lucky no damage to engine, this was 5x years back already.


Yeah not sure still. waiting for Suzuki to send me a full report on the case.
Oil is clean and its not losing any. so it can't be the pistons. I guess it can only be the valves.

But all of them????? :X

Last edited on Mon Apr 1st, 2019 06:12 pm by ricardoliveira

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 Posted: Mon Apr 1st, 2019 06:32 pm
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willem wikkel spies
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Mana: 
nope not valves, unless it ran too lean and burnt all of them.
but then you would have noticed it.

please give us all the symptoms.
it will make diagnostics easier

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 Posted: Mon Apr 1st, 2019 07:39 pm
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ricardoliveira
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willem wikkel spies wrote:
nope not valves, unless it ran too lean and burnt all of them.
but then you would have noticed it.

please give us all the symptoms.
it will make diagnostics easier

Basically it started a few months ago.
When engines were cold to turn them on you needed the acellerate them. After turning them on they would run fine.
I haven't used the boat myself for a few months, I've had someone use to take things to my cabin in the island.
I guess since it wasn't his boat he didn't notice it getting worse.
Last month I went for a ride and port engine wouldn't go past 4000rpm.
I was surprised. But I thought it would be something like dirty injectors. But it was starting to take longer and longer to as actually turn it on.
So o called my local mechanic and he cleaned the injectors and was still doing the same.
So he did a compression test in both engines which I attached a file with the results.
He later tried the compression stabilizer inside and after 24h with it he tried the compression test again and the results were the same.
That's when I contacted suzuki to see what they could do. So they sent their local dealer to come take the boat apart. And take it to durban the power head.
That already came to a total of 4500Rands.

Let me know if you have other questions.
Thanks for your interest

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 Posted: Mon Apr 1st, 2019 07:51 pm
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benniejordaan
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Mana: 
Rings, not valves. You mentioned it battles to start?

Last edited on Mon Apr 1st, 2019 07:53 pm by benniejordaan

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 Posted: Mon Apr 1st, 2019 07:55 pm
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benniejordaan
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What is a compression stabilizer?

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 Posted: Mon Apr 1st, 2019 08:07 pm
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ricardoliveira
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benniejordaan wrote:
Rings, not valves. You mentioned it battles to start?
Yeah it battles to start. Much worse the last few times I used.
If it was rings wouldn't It use up oil. Oil level never changed. And it looked clean.

Compression stabilizer was what yamaha dealer told me to try.
It's basically a carbonisation cleaner to remove excess or charcoal in valves and pistons.

Last edited on Mon Apr 1st, 2019 08:08 pm by ricardoliveira

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 Posted: Mon Apr 1st, 2019 08:15 pm
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pork pie
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Mana: 
was a compressed air leakage test done before stripping?

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 Posted: Mon Apr 1st, 2019 09:32 pm
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ricardoliveira
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pork pie wrote:
was a compressed air leakage test done before stripping?

No. Neither the mechanics gave me that option.
How do you do that? And how does it work?

Last edited on Mon Apr 1st, 2019 09:32 pm by ricardoliveira

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 Posted: Tue Apr 2nd, 2019 06:39 am
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pork pie
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Mana: 
each cylinder is filled with compressed air through the plug hole on the firing stroke at TDC via a special leakage tester. You can then hear where the leakage is via the intake system, exhaust system or filler cap. The gauge on the leakage tester will tell you what percentage compression is being lost.

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 Posted: Tue Apr 2nd, 2019 09:07 am
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Skeltonsc
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Havent seen the video
I take it that this is a four stroke?
did you check the timing before stripping I have had this on an Opel kadett that jumped a tooth on the cambelt, not enough to hit valves but enough for exhaust valve not to close at the right time.
this will certainly affect all the cylinders

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 Posted: Tue Apr 2nd, 2019 09:08 am
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Skeltonsc
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Havent seen the video
I take it that this is a four stroke?
did you check the timing before stripping I have had this on an Opel kadett that jumped a tooth on the cambelt, not enough to hit valves but enough for exhaust valve not to close at the right time.
this will certainly affect all the cylinders

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 Posted: Tue Apr 2nd, 2019 09:11 am
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ricardoliveira
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pork pie wrote:
each cylinder is filled with compressed air through the plug hole on the firing stroke at TDC via a special leakage tester. You can then hear where the leakage is via the intake system, exhaust system or filler cap. The gauge on the leakage tester will tell you what percentage compression is being lost.

Did not know that. But good to know.
Either way. Power head will need to be open. There isn't much you can do without opening it up.

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 Posted: Tue Apr 2nd, 2019 09:20 am
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ricardoliveira
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Skeltonsc wrote:
Havent seen the video
I take it that this is a four stroke?
did you check the timing before stripping I have had this on an Opel kadett that jumped a tooth on the cambelt, not enough to hit valves but enough for exhaust valve not to close at the right time.
this will certainly affect all the cylinders


yeah, good comment never taught about that.
But on this 4 stroke Suzuki comes with a timing chain and is a lifetime chain. I don't think this chain would move like the normal rubber ones.

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 Posted: Tue Apr 2nd, 2019 05:48 pm
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ricardoliveira
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Mana: 
I just got this reply from the Engineer:

Upon inspection of the above mentioned cyl-heads, we found the exhaust guides to be severely and abnormally worn, resulting in damage to the valve faces and seats. As this type of failure is usually the result of either insufficient valve to guide lubrication or excessive combustion and exhaust temperatures, we thus recommend a detailed inspection of the entire fuel/ignition system be carried out in order to pinpoint the cause.


Tomorrow he's going to send me the pictures.

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 Posted: Tue Apr 2nd, 2019 08:50 pm
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willem wikkel spies
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Mana: 
ok, interesting.

this is why the oil looked ok, no blow by, the rings.
but lost through valve seats on exhaust.

then it is running to lean!!!
lean will damage exhaust valves!!!

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