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Old 20-05-2020, 20:07   #46
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Re: Sea Water and Oil - How Much is Too Much for an Engine (2QM20)!

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Actually, most of us are wondering why she married YOU.
for my charm, lad, for my charm...

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Old 20-05-2020, 20:33   #47
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Re: Sea Water and Oil - How Much is Too Much for an Engine (2QM20)!

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for my charm, lad, for my charm...



Jim


So many ways to go with this one... but I will be strong.

Back to Wottieís reciprocating rust rotator... is it going yet?

And did I miss something? I thought the seawater had come in via the cam shaft driven pump? (One reason I much prefer the belt driven, stand-alone sort). Did a minor rebuild of an early Volvo Penta petrol donk for dad after that seal failed. It turned out that Volvo made the pump shaft out of mild steel. WTF!? Had one turned up out of stainless for chicken feed, not sure why they didnít do the same when they built the rotten thing.
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Old 20-05-2020, 21:09   #48
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Re: Sea Water and Oil - How Much is Too Much for an Engine (2QM20)!

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.......I thought the seawater had come in via the cam shaft driven pump? ..........
Never proven and the picture below of the camshaft that turns the RW pump suggests this wasn't the point of entry but the jury is still out.

Initially the PO thought it must have been a blown head gasket and arranged for a mechanic to do a compression test. The mechanic couldn't remove the injectors so that test never eventuated. The PO then bought another 2QM20 and the mechanics fitted it. The engine then sat under a house for quite awhile. Then I bought it ($50). The RW pump was off the engine and in parts although not all the parts were present.

By then it had no compression - I pulled the head and could not find any issue with the head gasket. The valves were badly pitted and the rings were stuck. I made the assumption the leak must have been the water pump">raw water pump in the light of no other evidence. However once the engine was pulled down, there asn't been any smoking gun re the water ingress.

Maybe it was the head gasket? Or the RW pump? The pressure testing between the water side and the oil side described upthread suggests the cast iron and the liners seals were OK.

Note, the PO didn't get the engine into this state, it was a PPO who did that and scammed the PO.
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Old 21-05-2020, 00:44   #49
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Re: Sea Water and Oil - How Much is Too Much for an Engine (2QM20)!

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Never proven and the picture below of the camshaft that turns the RW pump suggests this wasn't the point of entry but the jury is still out.




Well, you prompted me to go back and read the whole thing again, including the injector bit. I wish Iíd kept count of the number of posts telling you to take it to a machine shop.

Not too late for me to add one tho...

Mate, take it to a machine shop!

Ha ha, couldnít resist.

So, if Iíve come up to speed, this is NOT the engine for your current boat resto project?

As for the raw water pump theory, I still donít trust it, on principle. It was the one thing I didnít like about the new Beta but I concede that:

a) they all seem to do it this way now.
b) Beta have constructed it in a way that it should fail ďsafeĒ.

As for the MAPP gun, they are a bit of a bugger. They only JUST get pipe work hot enough to solder, and as they get older, they often fail to reach even that temperature benchmark. If Iíd been on the original thread of would have mentioned this, because it has bitten me (badly) before. Certainly an oxy/acetylene job.

Looking forward to the next update.
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Old 21-05-2020, 01:07   #50
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Re: Sea Water and Oil - How Much is Too Much for an Engine (2QM20)!

^^ Hey steady on, the injector jobbie was a win for me. They came out without any machine shop!

OK, I lost a round with the pre combustion chambers, mainly 'cause my oxy torch (and it's owner) moved out of town - can't count on some mates ()

Anyhow, if it makes you happier, the machine shop will seeing the head next week!
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Old 21-05-2020, 01:34   #51
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Re: Sea Water and Oil - How Much is Too Much for an Engine (2QM20)!

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^^ Hey steady on, the injector jobbie was a win for me. They came out without any machine shop!

You do know I was joking, right?

I mean, the number of people who told me I needed a professional to install my engine was remarkable.

Of course, Iím not sure why the boat now goes backwards... but Iíll figure it out.

Iíve got a friend who has been doing up a Yanmar MA3 in his garage to stave off the boredom of Covid isolation. But he made a living performance-boosting Harleys, so heís kinda in his comfort zone.

Still, canít help thinking it will be putting out more like 5 HP by the time he has finished. Heís the kind of guy who designs his own camshafts. A bit hard core.

But if this one proves too far gone, let me know, he may be willing to part with the MA3(5).
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Old 21-05-2020, 02:02   #52
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Re: Sea Water and Oil - How Much is Too Much for an Engine (2QM20)!

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You do know I was joking, right?

.......
As am I
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Old 21-05-2020, 02:08   #53
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Re: Sea Water and Oil - How Much is Too Much for an Engine (2QM20)!

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........
So, if Iíve come up to speed, this is NOT the engine for your current boat resto project?

.........
Correct. The stalled boat restore project has a fully restored YSE8 ready to slot in once the boat is finished. Although winter is right on top us, I must get cracking on the boat (soon).

Unfortunately I don't have a hull for this 2QM20 but I expect something will turn up if the engine comes together (but I gotta keep any potential hull a secret ATM )
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