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#1
Mechanicals / Re: A/C compressor confusion? ...
Last post by daantjie - 16 April 2024, 05:47 PMI'm not super familiar with the Hamilton unit but with the original unit if you hit DEF that should always give you compressor engagement and max heating coming out of the windshield vents.
Might still be worth taking it to a reputable auto AC shop and let them check it out. Sometimes you get lucky and they have an oldtimer on hand that has seen it all
Might still be worth taking it to a reputable auto AC shop and let them check it out. Sometimes you get lucky and they have an oldtimer on hand that has seen it all
#2
Mechanicals / Re: Mercedes 450SEL 6.9 engine...
Last post by daantjie - 16 April 2024, 04:06 PMI still highly doubt that the suspension pump could make such a racket. You could take a mechanics stethoscope and put the probe to the pump to see if you hear this clacking noise inside the pump. Sometimes these very basic tools can be quite helpful.
#3
Mechanicals / Re: Mercedes 450SEL 6.9 engine...
Last post by harrycarry250 - 16 April 2024, 01:47 PMThank you, yes that is the most logical thought process and id like to believe I have considered all the small potentials.
This has been an issue for over 6 years.
I've had cars with bad rod bearings and this doesn't really sound like one, but you never know.
To those who have had the pump noise. Did your suspension function as normal?
This has been an issue for over 6 years.
I've had cars with bad rod bearings and this doesn't really sound like one, but you never know.
To those who have had the pump noise. Did your suspension function as normal?
#4
Mechanicals / Re: Mercedes 450SEL 6.9 engine...
Last post by Gpapaniko - 16 April 2024, 08:08 AMI had an intermittent loud ticking noise on my M110 engine and found it was the air filter housing hitting the valve cover occasionally, especially when the engine was warm with just a little bit of a rough idle - the point is, I starting thinking it was a rod bearing and ended up with something super simple.
#5
Mechanicals / Re: Mercedes 450SEL 6.9 engine...
Last post by tcj - 16 April 2024, 03:11 AMbroken rotocaps do make such noise.
A (small) crack in the exhaust manifold can add to this too. Look for gas pulsing on the downside of the exhaust manifold.
A (small) crack in the exhaust manifold can add to this too. Look for gas pulsing on the downside of the exhaust manifold.
#6
Mechanicals / Re: Mercedes 450SEL 6.9 engine...
Last post by harrycarry250 - 15 April 2024, 03:36 PMI have not thought to check the rotocaps specifically. But I have spent many hours staring at the valvetrain and I did not notice any abnormalities. Exhaust manifold is solid, if that is what you're referring to.
Thank you
Thank you
#7
Mechanicals / Re: Mercedes 450SEL 6.9 engine...
Last post by tcj - 15 April 2024, 02:59 PMHave you already ruled out the rotocaps?
Crack in the manifold?
Crack in the manifold?
#8
Mechanicals / Re: Mercedes 450SEL 6.9 engine...
Last post by harrycarry250 - 15 April 2024, 02:01 PMHello all, thank you to everyone who posted their insight over the years!
The saga continues on this vehicle. I took a long (LONG) hiatus from looking at the car. I put stabil in the tank and started up the car periodically over the years to the keep the suspension happy. Shockingly the vehicle has remained in a relative state of quality as the years have gone by.
Since we last spoke:
I did the full valve shim procedure and while I did make many adjustments, the sound of the engine did not change whatsoever. I also inspected inside the cylinders and did not notice any scouring.
The motor still makes the exact same noise but it does not seem to be getting worse.
Here is the link again. Any thoughts? The only thing I have not done from the thread is to remove the hydraulic pump and run the engine without it. I feel like the next step after that is to inspect the rod bearings. Does anyone have a video of their engine with a bad pump? I would be shocked if a pump could make such a noise.
https://youtu.be/TFkaaZfeUj4?si=bRRY-xCOS7dTWmYQ
As an update to newcomers: Strange intermittent ticking noise from engine. Valves adjusted, chain and guides replaced, all hydraulic lifters replaced.
The saga continues on this vehicle. I took a long (LONG) hiatus from looking at the car. I put stabil in the tank and started up the car periodically over the years to the keep the suspension happy. Shockingly the vehicle has remained in a relative state of quality as the years have gone by.
Since we last spoke:
I did the full valve shim procedure and while I did make many adjustments, the sound of the engine did not change whatsoever. I also inspected inside the cylinders and did not notice any scouring.
The motor still makes the exact same noise but it does not seem to be getting worse.
Here is the link again. Any thoughts? The only thing I have not done from the thread is to remove the hydraulic pump and run the engine without it. I feel like the next step after that is to inspect the rod bearings. Does anyone have a video of their engine with a bad pump? I would be shocked if a pump could make such a noise.
https://youtu.be/TFkaaZfeUj4?si=bRRY-xCOS7dTWmYQ
As an update to newcomers: Strange intermittent ticking noise from engine. Valves adjusted, chain and guides replaced, all hydraulic lifters replaced.
#9
Mechanicals / Re: A/C compressor confusion? ...
Last post by 79W116 - 15 April 2024, 11:39 AMAnyone know any good mechanics around the Howell Michigan area that know these cars?
#10
Mechanicals / Re: A/C compressor confusion? ...
Last post by 79W116 - 15 April 2024, 11:31 AMThat is unfortunate.