broken camshaft

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07 Nov 2012 17:41 - 07 Nov 2012 19:48 #1 by Joseph Baz
Joseph Baz created the topic: broken camshaft
Perkins camshaft in three pieces,surprisingly nothing else was damaged... lots of noise though

Cheers,Joe

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Last Edit: 07 Nov 2012 19:48 by Hal Harvey.

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07 Nov 2012 18:25 #2 by Alister McBride
Alister McBride replied the topic: broken camshaft
Damn!!! What were you doing to it??? Gonna be plenty of metal filings everywhere now... Good Luck!

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08 Nov 2012 05:54 #3 by Joseph Baz
Joseph Baz replied the topic: broken camshaft
Started with a tick and finished with a bang,it wasn't me,the engine is all stripped now and ready to be rebuilt.
Cheers,Joe

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08 Nov 2012 20:34 - 08 Nov 2012 20:35 #4 by Garry and Chris
Garry and Chris replied the topic: broken camshaft
We had that problem 18 K out of Broome just after getting of the CSR Everyone said they had never heard of it before DO NOT break down near Broome the RAC / ARB agent is a thief
charge 40 hours for a 2 day job and then wanted more blood when his so called mechanic screwed up Developed into a bit of a disscussion When we told locals where Oka was all shock their heads and said Why did you take it there?
Garry

OKA 306
Last Edit: 08 Nov 2012 20:35 by Garry and Chris.

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08 Nov 2012 20:53 #5 by James and Usha
James and Usha replied the topic: broken camshaft
That is some serious force behind that damage Joe. Do you know what caused the failure?

#072

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08 Nov 2012 21:16 #6 by Joseph Baz
Joseph Baz replied the topic: broken camshaft
Looking at the centre journal there is no signs of friction,the surface is covered by tarnished oil film which indicates to me a greater clearance than needed with little support,will check the dimensions once the new camshaft arrives,unfortunately the Perkins only have one bearing at the front of the shaft the rest runs on the block casting and the only way to correct any wearing will be by tunnel boring and fitting a sleeve/liner to bring it back to within tolerance,once the parts arrive we will check all dimensions and will do a full rebuilt.
Cheers Joe

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08 Nov 2012 21:28 #7 by dandjcr
dandjcr replied the topic: broken camshaft
Never seen a broken camshaft like that before Joe. The only cause I can think of is a badly stuck valve or tappet/rocker failure but that would normally cause a bent valve head or stem. Any obvious piston damage?

David and Janet Ribbans - Oka 148
Oka148 profile here.
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08 Nov 2012 21:30 #8 by Joseph Baz
Joseph Baz replied the topic: broken camshaft

Garry and Chris wrote: We had that problem 18 K out of Broome just after getting of the CSR Everyone said they had never heard of it before DO NOT break down near Broome the RAC / ARB agent is a thief
charge 40 hours for a 2 day job and then wanted more blood when his so called mechanic screwed up Developed into a bit of a disscussion When we told locals where Oka was all shock their heads and said Why did you take it there?
Garry

Garry,you should complaint to the RAC as the towing fees are regulated by them the standard rate is about $2.70 per Km,the problem is once you get to the workshop there is no control,if you have good RAC cover you are better off opting for a relocation.
Cheers,Joe

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08 Nov 2012 21:48 #9 by Joseph Baz
Joseph Baz replied the topic: broken camshaft

dandjcr wrote: Never seen a broken camshaft like that before Joe. The only cause I can think of is a badly stuck valve or tappet/rocker failure but that would normally cause a bent valve head or stem. Any obvious piston damage?


David,the funny thing is that no other components are damaged,there is some markings on No1 piston as if something filtered into the cylinder,its strange as no markings are visible to the valves or the head,it may have been damage from another time,hard to tell as the engine has been opened before,the markings on the broken camshaft shows one broken section were it was still working and the second fracture was a clean break,push rods pop out and the engine stopped,surprinsingly no other damage occurred.
Cheers Joe

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25 Nov 2012 15:04 - 27 Nov 2012 22:13 #10 by Joseph Baz
Joseph Baz replied the topic: broken camshaft
You can't believe that someone just fitted a set of rings to this piston and thought that it will be alright, it's part of the same motor with the broken camshaft, cheers, Joe

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Last Edit: 27 Nov 2012 22:13 by Hal Harvey.

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27 Nov 2012 16:25 - 27 Nov 2012 17:37 #11 by Richard and Beverly House
Richard and Beverly House replied the topic: broken camshaft
Hello Joe, We had a strange incident with 080. After having the Engine rebuilt. The head having been rebuilt by a supposed specialist. I was driving in the Metro area when the motor seized. It was towed back to the mechanic and sorted out. Subsequent to that we were heading to Hyden when the oil filler cap melted,that was the second melting. We got home with a piece of Jam tree plugging the filler hole.The head went back for another rebuild. After that we were on tour between Rawlinna and Cocklebiddy when a valve jammed , stopping the motor. The valve stem was bent severely. When the motor was dismantled a mark was found on a different piston, obviously from the first seizure. We ended up with another head and I don't know what happened to the other one. One could guess!

Richard and Beverly House Oka 080
Last Edit: 27 Nov 2012 17:37 by Hal Harvey.

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27 Nov 2012 21:22 - 27 Nov 2012 22:16 #12 by Joseph Baz
Joseph Baz replied the topic: broken camshaft
Hi Richard, nothing surprises me any more, I'm doing this engine for another fellow OKA owner and I cannot believe how hard it is for people to provide the service that is expected of them. We just had a con rod returned as ok only for me to find a misaligned cap with the threads of the bolts half stripped, now we have a replacement con rod with heat marks to one side and polishing/grinding marks to the other side.

I questioned the history of the con rod but no one knows, if you are selling a second hand replacement part because you don't have a new one you should know what you are supplying, saying there is no warranty on used components is not good enough, but sooner or later I will have this engine the way I want it and will be a sweet sounding Perkins.

Cheers, Joe
Last Edit: 27 Nov 2012 22:16 by Hal Harvey.

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