defenitly dosnt look like a kelford defect more or less something gave out pretty bad or wasnt tightened to eat away at that came as much as it did.

 

Nah. That steel dowel would have mashed through that aluminum mivec gear internal like butter if not lined up. Too hard of valve springs could have been a contributor also.

 

As I stated before I agree that I could see the damage to the cam gear happening from valves hitting the pistons.

Can anyone explain how the cam is damaged like that?


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Any other suggestions?

The only other theory I have is that somehow the dowel was removed and replaced with one that was not meant to be.....wiggled around causing cam damage and when the gear was out of time enough the valves hit the head and then caused more damage to the cam gear.

 

if you have to ask people for this type of advice yoi really shouldnt be working on your own car.

 

I was asking for suggestions not advice on what people thought happened. Obvioulsy I know what happened but there is much speculation about how it actually happened, what went wrong first. I made this thread to discuss some other ideas of what happened before I put it back together. Since no one including DB can come up with anything except this cam/Mivec gear damage, maybe you can enlighten everyone instead of posting comments like that to a person that you have no clue about their experience.

Maybe before you make comments like that you should read the entire thread.

This was the only thing I found that seemed to explain how everything went wrong, which you would have known if you read the entire thread.

I am rebuilding it, I am almost done and I replaced every timing component even though everything was suposedly 1k miles old. Contrary to your comments I will continue to work on my own vehicle. I have owned performance cars for a long time, I am no expert but I have years of experience wrenching on cars.

I thought this is a forum so that people could discuss ideas and learn from one another?

 

94awd is intelligent and helpful(tho sometimes comes off a bit rash), but I think what he was trying to say in few word was this:

It's going to be hard to say exactly what happened, we can speculate over multiple scenarios(of which everyone has), however we will never know the exact sequence.

Unfortunately with cars(stock or modified) these things just happen. The only thing you can do at this point is put it together correctly, and know that you did everything right, and enjoy your baby

 

I guess it is time to give up the speculation.

All I can do is replace everything and move on, just wanted to figure out how it all started.

Maybe 94awd can be helpfull and inteligent but in this case I found him to be anything but helpfull or inteligent.

 

Deleted

 

I don't blame you what-so-ever for wanting to figure out what happened, I've been there many times before. Sometimes you find it, sometimes you don't.

 

Known issue with early Kelford IX 272's... Mivec snaps.

I guess you could google it....

https://www.evolutionm.net/forums/ev...m-snapped.html

 

this should have been the end of discussion as its very obvious this is exactly what happen.

 

Ok, so how do you think that hole for the dowel pin got like that? This is what I was looking for opinions on but no one seems to want to give an educated guess as to how the cam was damaged like that.
I am no expert but if the dowel is the same material as the cam shaft I don't think 1 jolt from he valves hitting the pistons would cause this..... Especially if the aluminum cam gear spun. The steel would eat through the aluminum but how do to of he same materials cause that to happen to the cam?

Do you see my point now?

I have and read about earlier kelford cams snapping and such but not this issue. This is why I have posted this thread.






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if you have ever driven car with cam bolts left loose you will be treated to loud rapid rod knock type sound. the valve train opening and closing puts harmonic vibrations into the cam. so when conection is left loose it vibrates like crazy.

in this case the cam gear was tight but not seated on the end of cam gear because it was seated to top of of dowel pin. slowly with many revolutions the cam gear was dragged over the pin ,being bombarded with thousands of harmonic impact vibrations, the pin was dragged sideways along with the cam gear.

it took me 30 seconds to look at pictures and determine this is what happen. the marks are very clear this is what happen. there isnt another possibilty that would make any sense.

 

Thanks for the diagnosis. This is the first time I have never had any motor problems like this.