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Crikey! That sludge is phenomenal. Not that I have much experience but I'd guess it's pretty unusual. There are some pretty big lumps in there. It is surely all through the engine, not just the places you can see. Having gone to the effort you have is there any way of cleaning out the passages etc?
I have a new endoscope that I am going to have a look around the inside of my rocker cover.
Good luck,
Pete
I’ll bet the oil passages in the rocker arms are blocked as well. It would be worthwhile pulling them apart to check.
It shouldn’t cost too much to run some cheap oil and a cleaning additive for a while, then drop it out and put the good stuff in.
Yes sounds like the best idea.
How much slop/slack is normal in a timing chain. It seems like it has too much slack to me. The motors I normally work on have oil pressure fed pads keeping any slack in the timing chain tight. These chains don't have anything to hold them taut.
I have decided to remove a big end and a main bearing to see if there is any scoring. I almost feel like rebuilding the motor now it is stripped down so far. But my cheap low mileage car is starting to become expensive if I do that. At my age and the low milage I do in this vehicle I will not get the benefit.
The timing chain on my old motor seemed slack too. However, the new secondhand one was exactly the same, so I’m not concerned about it.
Hate to pay for a new one only to find it was the same. Plus there would be the hastle of fitting it if the gears are a tight fit. Rave does not say "keep the chain tight in the drive direction when fitting". Or perhaps the little timing marks only line up if the chain is tight in the direction of rotation. I wonder why it would be manufactured so slack? Perhaps that is to allow it to be fitted but.....I am unsure. May be I should put it up as a question on a new thread. There could be a real mess if the chain was to jump a tooth. I once worked on an engine (not L/R) and the manual said do not turn the engine in its reverse direction as the chain may jump a tooth. I'll check the alinement of the marks, if the chain is worn they won't line up will they? Do chains usually wear at such low kilometres? Working on an unfamiliar engine is ... well, interesting.
Have to say, first time I removed the sump on my '79RRC, I reckon mine had worse sludge.
Every oil change for a while .. maybe every 5K klms and using cheaper oil was with a sump drop and clean out. sludge in sump got less and less.
Can't remember how many times I did it, but it was lots. I used to average about 70-100K klms a year in some years.
Eventually came good in that the oil stayed cleaner for longer between oil changes(every 10K) .. but the heads were still gunked up like yours.
While it probably was a problem .. in reality it wasn't a problem, as that motor went on to do hundred of thousands of klms after that period .. total klms mid 600K klms.
Totally original, no rebuilds, nuthin. Mainly seals replaced, but no mechanical works to motor.
Now I am starting to worry a bit about the state of the motor. I feel grit, like fine sand, through out the sludge and in places it has to be scraped off. Like the bottom of the sump and the tappet covers. Just to explain why this worries me. The vehicle was in storage because of a legal dispute about ownership of the vehicle. Supposing the loosing party decided to pour sand into the motor. I bought privately and have owned the car for over 12 months so " not happy Jan".
the grit is likely to be carbon from the oil burnt off on the underside of the pistons and the oil breaking down.
Not the worst I've seen by a very long shot. When you drop the sump that weighs in at about 20kg after draining about 600ml of oil out of it and find that is caked full with sweep marks in it for the big ends and counter weights then its bad.
go your hardest with the gurney so long as you keep the cam and the crank bolted in everything will just hose out. to clear the oil galleries plumb in a fresh feed of oil from a hand pump into the oil pressure gauge port and run at least 8 psi of oil when it starts dripping out of everywhere slowly turn the crank over by hand.
Ok thanks for that Blknite.au. I feel much better and will do that specially the feed through of oil great idea.