Burned Valve Database DATA ONLY or a P0455 code will be set

[mecheng]

Robert, I had Alfa Romeo's back in the 70's and the very early ones had no valve
stem seals, I don't really think that is it. It is possible that if the seals are bad,
then also the guide clearances are wide and then the valves don't seat as well
leading to leaks and then burned valves.
They were all NA and they all had Sodium cooled exhaust valves.

Come on man, I doubt that Alfa had an engine built like the B5234 nor did it have 350,000+ miles.

Your engine served you well!! Name one other high performance engine that can last as long as these While Blocks.
Key word, high performance.

[June]

Updated Pareto analysis, thanks to all that listed their data. Please try to answer all the questions as it creates a complete picture.

Interesting to note that most failures were with aftermarket coolant as the Volvo coolant has been reportedly designed to reduce hot spots in the engine due to turbo charging. Also interesting to note that none were with aggressive driving owners as the valves apparently rotate over 3000 rpm and therefore may clean the deposits. I occasionally run the car in 3rd gear at highway speed for a minute or two for this very reason!

Need more data to draw conclusions, so keep them coming.

I wanted to add what my Volvo dealer told me when my 1998 V70 was a couple years old and had hard cold morning start problems. Oh it was a 2.3 hpt auto equipped car. It also in conjunction with the hard starts also had rough idle in gear almost like a misfire. Car under full warranty at time Volvo dealer told me 5 cylinders engines have problems with deposit forming on valves and causes seating problem causing the problems I experienced.

I was instructed by my Volvo dealer service to reseat and remove deposits from the valves to run the car in second on the highway rpm at 5000 for five minutes without interruption and ac off.

Then the valves would reseat. It worked like a charm and the car would idle smoothly and start right up cold for a while.

I noticed car needed it every six months or so. I did a lot of one mile trips per day with that car. I would think it would cause extreme heat and pressure incinerate any deposits during those five minutes.

I have done it to every Volvo since as preventive maintenance about every six months and never had a rough idle or hard cold start or any sort of valve trouble. June

I assume that you are stating that you have never experienced a burnt valve in any of your vehicles. I do aggressive runs a few times per week but nothing like 5000 RPM for over 1 minute at a time.

Do you mind me asking what kind of high mileage have you experienced?

No burnt valves ever. Always service with Volvo so volvo coolant and parts always. One family early 1990s Volvo wagon had the odometer quit after 400,000 miles were showing and still ran great until it was totalled many years after that like in 2011 or 12. That car still had it's original engine and transmission untouched but for normal service. My current Volvo is at 143k and still feels as it did new just as quiet and smooth and has never used a drop of oil. Also untouched except for normal service. June

[rspi]

I wanted to add what my Volvo dealer told me when my 1998 V70 was a couple years old and had hard cold morning start problems. Oh it was a 2.3 hpt auto equipped car. It also in conjunction with the hard starts also had rough idle in gear almost like a misfire. Car under full warranty at time Volvo dealer told me 5 cylinders engines have problems with deposit forming on valves and causes seating problem causing the problems I experienced.

I was instructed by my Volvo dealer service to reseat and remove deposits from the valves to run the car in second on the highway rpm at 5000 for five minutes without interruption and ac off.

Then the valves would reseat. It worked like a charm and the car would idle smoothly and start right up cold for a while.

I noticed car needed it every six months or so. I did a lot of one mile trips per day with that car. I would think it would cause extreme heat and pressure incinerate any deposits during those five minutes.

I have done it to every Volvo since as preventive maintenance about every six months and never had a rough idle or hard cold start or any sort of valve trouble. June

I assume that you are stating that you have never experienced a burnt valve in any of your vehicles. I do aggressive runs a few times per week but nothing like 5000 RPM for over 1 minute at a time.

Do you mind me asking what kind of high mileage have you experienced?

No burnt valves ever. Always service with Volvo so Volvo coolant and parts always. One family early 1990s Volvo wagon had the odometer quit after 400,000 miles were showing and still ran great until it was totalled many years after that like in 2011 or 12. That car still had it's original engine and transmission untouched but for normal service. My current Volvo is at 143k and still feels as it did new just as quiet and smooth and has never used a drop of oil. Also untouched except for normal service. June

When you say EARLY 90's, that is likely a red block. I've never heard of a burnt valve in those. They were not BUILT BROKE.

[June]

Like a 92 or 93 or even maybe a 94 960 wagon and I do believe it had a 2.9 NA engine. Odometer stopped at like 42X,XXX miles many years before my father totalled it. That would be a sister to the 2.9 in my S80 correct? Started as moms, then went through both my sisters school car then kept as a haul anything around car for any of us to use. I already was married and living my own life when that car was bought as I am the oldest so I am not 100% sure of the year other than early 90s and I bought a 960 because I liked that wagon and my 960 was a 1995. Mom to this day only uses premium fuel and still uses dealer service only so I know the car was kept maintained by Volvo and used premium fuel. It for years was the running joke that it would never die and it never did. Like me my mother who is pushing 84 now also runs a car with vigor. Lots of WOT for sure. No burnt valves or anything major ever went wrong with the power train. June

[thebull]

Post by mecheng » Today, 05:23

thebull wrote: ↑
Yesterday, 19:21
a) Year = 1993
b) Model = 850
c) Mileage Total = 220 000km
d) Mileage under your ownership = 20 000km
e) Octane Gas you typically use = 91
f) Supplier of Gas = Shell
g) Driving Cycle (% city/ % hwy) = 80% city 20% hwy
h) Driving Behaviour (average, passive, aggressive) = average
i) Typical Load in Vehicle: single occupant, or multiple occupant = two people
j) Location and Typical driving weather = -10 C to 37 C
k) Does the car have leaky valve guides (ie: blue smoke at start up) = Oh Yes!
l) What kind of oil do you use - Castrol 5W40
m) Describe in detail how it happened: (ie: ambient temperature, throttle input, load, etc.) = Fresh Oil change and on the hwy.
n) How many valves burned and which Cylinder = 1 valve #3 cylinder
o)What brand coolant do you use, when was it last changed. = Volvo coolant at 204 000km with the timing belt
p) What did you do with engine/car = New head-gasket, lap all the valves (with 3 new exhaust one), new valve guide seals.

I sold this car to friend of mine. Now approaching 300 000km and runs strong. No oil consumption.

Image

Car after
Image

What engine/model?
1998 Volvo S70 T5 - SE - 240km
1997 Volvo 850 GLT - 190km
Boost is my drug of choice
Top

Ops, did not mention that one.

2.5l without turbo.1993 850 GLT

[bmdubya1198]

Like a 92 or 93 or even maybe a 94 960 wagon and I do believe it had a 2.9 NA engine. Odometer stopped at like 42X,XXX miles many years before my father totalled it. That would be a sister to the 2.9 in my S80 correct? Started as moms, then went through both my sisters school car then kept as a haul anything around car for any of us to use. I already was married and living my own life when that car was bought as I am the oldest so I am not 100% sure of the year other than early 90s and I bought a 960 because I liked that wagon and my 960 was a 1995. Mom to this day only uses premium fuel and still uses dealer service only so I know the car was kept maintained by Volvo and used premium fuel. It for years was the running joke that it would never die and it never did. Like me my mother who is pushing 84 now also runs a car with vigor. Lots of WOT for sure. No burnt valves or anything major ever went wrong with the power train. June

Yeah, that would be the 2.9 white block straight six. I love stories like that... the car just keeps running and running from being maintained regularly. If only everyone knew how to maintain a car...

[June]

Like a 92 or 93 or even maybe a 94 960 wagon and I do believe it had a 2.9 NA engine. Odometer stopped at like 42X,XXX miles many years before my father totalled it. That would be a sister to the 2.9 in my S80 correct? Started as moms, then went through both my sisters school car then kept as a haul anything around car for any of us to use. I already was married and living my own life when that car was bought as I am the oldest so I am not 100% sure of the year other than early 90s and I bought a 960 because I liked that wagon and my 960 was a 1995. Mom to this day only uses premium fuel and still uses dealer service only so I know the car was kept maintained by Volvo and used premium fuel. It for years was the running joke that it would never die and it never did. Like me my mother who is pushing 84 now also runs a car with vigor. Lots of WOT for sure. No burnt valves or anything major ever went wrong with the power train. June

Yeah, that would be the 2.9 white block straight six. I love stories like that... the car just keeps running and running from being maintained regularly. If only everyone knew how to maintain a car...

Okay, I asked dad about that car and he said to his memory it was a 1993 but could have been a 94. It was a 960 which I knew allready. He followed all scheduled maintenance except 10W30 non synthetic changed every 1,500 miles mostly. I drive peacefully compared to my mother. She is really scary to ride with and still at 83.5 years old runs the piss out of a car. Dad felt the oil needed to be kept fresh plus his 1950's mindset in regards to cars.

Apparently his first car a 1957 Cadillac had a 1000 mile oci and that Eldorado was his favorite car ever owned and Cadillac had it right as that car lasted. He said the transmission fluid was drained and refilled every 6000 miles per the maintenance schedule. Also he has the coolant changed every fall to "winterize" the car and does it to this day. He compares everything to that Cadillac like it is the standard. For me it's Volvo.

The 960 wagon also got winterized every year along with a transmission service and drain and refill the axle oil. He said the power train never gave trouble other than normal items belts, hoses, tires, etc. He also said the only oil leak the car ever had was the oil cap gasket had to be replaced and some sort of seals twice, I think he is talking about cam seals.

Near the end of the car's life I drove it and it still felt like a Town Car it ran so smooth. Definitely the engine transmission or axle ever had trouble. He said the engine never came apart for sure No pcv trouble either he didn't know what that is but the car never had a expensive repair other than the big schedule maintenance times. Definitely premium fuel was always used and between my mother and to sisters the car got the crap beat out of it.

In his stubbornness after hernia surgery he tried to drive it and made it up the street before realizing he couldn't push the break pedal to stop so he ran it into a garbage truck stopped to empty trashcans to stop the Volvo. That is what killed that car. I have no doubt that car could have been still on the road.

He also said the odometer quit just before 450K and had been repaired twice by the dealership but the car was not worth fixing the odometer again. I guess it must have been a flaw in the speedometer. Me, mom, and my sisters all agree we loved that wagon.

[rspi]

Awesome! Thanks for sharing.

[jamescooper]

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[abscate]

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