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Old 08 June 2012, 17:13   #1
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Lost compression - How much on a rebuild kit?

My Mercury 1999 75hp 2 stroke with oil injection has suffered some kind of failure which has caused damage to my engine. I had compression tested it 3 days ago and all three cylinders had a healthy 130psi each.

While out at sea the engine died suddenly for no reason but started back up ok, on the way back it happened again and for some reason if i went over 15knots the engine would cut out.

On the 3rd restart the engine was now missing on one cylinder and we limped back on two cylinders to the dock.

I have had the engineer call me today saying that he compression tested it and it now has

80psi
32psi
80psi

So somehow its killed its self, he noted he couldnt see any blue smoke coming from it especially when starting cold and suspect possibly its not been injecting oil. I am gutted

Engine was mint now its bloody fooked and i expect a big repair bill. I am just preying the damage to the powerhead isnt so bad that its scrap and can be at least bored oversize if need be.

Can anyone give me prices on a engine rebuild kit for a Mercury 1999 two stroke 75hp (Red stripe top). May as well overhaul the whole thing.

The engineer has recommended that we bin the oil injection system and go premix in future, they do all the RNLI boats and he told me thats the first thing they do, they dont even bother using the oilers as its a REALLY expensive repair if they ever fail and are not worth the risk, more so in an older engine.

luckily this guy is not expensive and does alot of the local fishermens boats, he said 100 at this point to tear the powerhead down into its parts and find out what the damage is, i am praying its not completly shagged!
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Old 08 June 2012, 17:26   #2
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With 80/32/80 compression I reckon you've had an oiling failure too.

I'd change the powerhead. At the least you're going to need rebore+pistons on each cylinder, but quite possibly some new bearings too.
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Old 08 June 2012, 17:33   #3
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powerhead

Yeah its gone from 130psi 3 days ago then down to 80,32,80!

A new powerhead would no doubt be ridiculous money i noted they do oversize pistons on these and rebores are cheap as chips.

I eagerly await the report tomorrow, brown pants time!
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Old 08 June 2012, 17:36   #4
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Sounds like there's more to this than meets the eye. Didn't you report problems recently on this ? were they not resolved before going back out ?

Like Nos said I'd swap the powerhead. As it happens, I think I had posted one up here not that long ago which was available through a contact, brand new over-stocked powerhead (including all internals but no exteriors carbs etc so you'd still need to check into the oil system). It'll be a drop on replacement, although it's 90hp model (same block)

Would you like me to check If it's still available ?

Peter @ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007
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Old 08 June 2012, 17:41   #5
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Yeah it was running lumpy when i had it and sneezing, it blew off the fuel pump pipe and i had replaced it with a new one, I had also linked and Synced the carbs after this happened and it seemed to fix the original problem of it sneezing. It ran fine for about 6hrs use after this so i think its unrelated.

Yes please can you get me a price on the block?
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Old 08 June 2012, 17:44   #6
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It won't be cheap as its new/unused but it's a better option than a re-build IMO. Update when you know the situation and I'll check it's availability and let you know.

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Old 09 June 2012, 08:04   #7
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if you are going to rebuild your p/head and want it rebored as it will be what they call a blind bore it can be expensive, if it is any help if you go down the rebore route they dont all have to be the same size bore as all the pistons are the same weight, but spares will probally be expensive , and a new p/head would be better (cheaper)if you keep the oil injection please have a good look at it and dont re-fit a (for example a dodgy oil pump) if you want to pm me and i will go into it further if you want me to
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Old 09 June 2012, 08:47   #8
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Well I have a good engineer for the workshop part so I don't think the machine side will be that expensive. How much should I expect to pay for a new power head?
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Old 09 June 2012, 08:57   #9
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I am sorry I dont know prices ,I only know how to fix them I used to work for the distributer so nearly all the repairs that i did came under the warranty banner.it might be worth giving Robby at Blackdog marine either a ring or a pm he is on this site
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Old 09 June 2012, 09:12   #10
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I just mentioned to the machine shop its a blind bore, so he said he won't know if their machine will reach it until they look at it, dam oh well !
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