Locked solid lump

I wonder how many boat owning R Wardale's there are?

Last season, or maybe the one before, anchor off Bembridge at low tide in the evening, paddle ashore, have a pint with parents and paddle back out?
 
rwardale said:
Thanks for the comments from the budgie fraternity, back on track.....
Replacing the injectors one at a time showed that there was a compression issue with the 2nd pot.
Whipped the head off, and pot 2 was full of oil, that had leaked through the head gasket. I put diesel and wd40 in to try to unseize the piston. The bores are nice and shiny, no scoring.
Now the injectors have been returned to be serviced - £40-50 per item, and the head is off to be cleaned up professionally with feedback on the flatness of the head and state of the valve and valve stems.
One thing at the back of my mind - what caused this to seize in the first place, I still have not got a good answer.
Click to expand...

A head gasket leaking oil is almost certainly also able to allow water past as well. It could well be a related to whether the engine is running and hot or stationery and cold so the small amount of water which leaked past after you last stopped the engine has now stopped leaking - the corrosion is somewhat self-sealing - but the oil has continued to find its way past as oil is definitely not self-sealing.

It doesn't take much corrosion on the bore and rings to seize a piston but you seem to have been unlucky that it took such a struggle to free it.

Anyway, a new gasket and a distortion-free head and it should be as good as new.

Richard
 
The offending gasket....
It looks like the gasket is starting to de-laminate between the bores and the long slot at the bottom, that takes the conn rods and leads to the cam shaft. The one that caused the problems is the right hand one.
And below that, the results of the leak...

IMG_3073.jpg
IMG_3062.jpg
 
rwardale said:
The offending gasket....
It looks like the gasket is starting to de-laminate between the bores and the long slot at the bottom, that takes the conn rods and leads to the cam shaft. The one that caused the problems is the right hand one.
And below that, the results of the leak...

View attachment 57151
View attachment 57152
Click to expand...

I hope you mean pushrods, if you have conrods in there, you have a real problem! :)
 
rwardale said:
The offending gasket....
It looks like the gasket is starting to de-laminate between the bores and the long slot at the bottom, that takes the conn rods and leads to the cam shaft. The one that caused the problems is the right hand one.
And below that, the results of the leak...

View attachment 57151
Click to expand...

The gasket is not in that bad a condition although, as you say, there is some discolouration on the right hand side although I can't tell if those are oilways or waterways. The delamination could be a result of the head being removed. Whilst the head is off obviously make sure you check the valve guides and any oil seals just to rule out any oil seepage down the valve stems.

Richard
 
Don't forget to flush out all of the engine oil. There must be water in it so it needs removing ASAP. I had to remove contaminated oil last year, oil mixed with diesel was AL and Norm's recommendation at Bukh although I was lucky cos I'd fitted a pump on the sump the year before so I could get rid of all of it. Removing it through the dipstick doesn't get rid of anything like all.
 
Champagne Murphy - the pump on the sump intrigues me, as I am always looking to do things better-er. Do you have any details or piccys?
Enough about you... Just picked up the head from Banda engineering in Portsmouth, it has been through the washer, stripping much of the paint off, the head skimmed and valves recut and lapped. (£60 in 2016) Looks great, but it did highlight that the exhaust valve on cylinder 2 had some corrosion. Looking back at photos when I took the head off, the rearmost valve is open when the engine is a TDC!!! Doh, how did I miss that one. Hopefully the source of the seized engine. Some pitting can be see on the head Valve guides are good and the head ready for a coat of paint and putting back together. I have bought replacement O-rings that go on the inlet valves and a new head gasket from Bukh in Poole. (£85 for the gasket and £5 for the O-rings). Expecting to pick up my refurbished injectors on Friday from Panda Diesel in Fareham for about (£100). Then put it back together and not be left with that one bolt.....
Shiny and flat!!
IMG_3093[1].jpgIMG_3091[1].jpg
 
rwardale said:
Looking back at photos when I took the head off, the rearmost valve is open when the engine is a TDC!!! Doh, how did I miss that one. Hopefully the source of the seized engine.
Click to expand...

I would be very surprised if the open valve was the source of the seize as a) you would have been able to rotate the engine backwards whereas you had restricted movement in both directions and b) when you freed the engine and rotated it forwards it would have jammed again on the next cycle unless the valve stem were bent or the piston indented and neither of those is presumably the case.

Tappets normally loosen off rather than tighen up so I'm intrigued how the clearance has slipped. I've seen it on both chain and belt driven camshafts where the chain/belt has slipped but I guess you have a sprocket drive off the crankshaft so slippage is extremely unlikely.

It's certainly worth you pinning down the source of the valve problem.

Richard

Further to Roger's post below, I am indeed assuming that we are talking about TDC on the compression stroke.
 
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rwardale said:
Looking back at photos when I took the head off, the rearmost valve is open when the engine is a TDC!!! Doh, how did I miss that one.
Click to expand...

If that was before you took the head off you could have a valve just open at TDC as one cylinder is on the compression stroke and in the other cylinder the exhaust would be just closing and the inlet just opening depending on the exact valve cam timing.

If it was after you removed the rockers than it could be a worry as the valve would be jammed open for some reason.
 
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