Yamaha 70beto engine repair mechanic wanted

57paulimo · 06 January 2022, 18:32

Hi, as per my messages last year I have the above engine which I'm really struggling with.
I need professional advice as to where to go next. I've changed so many parts ( big thanks to Davie @ David Anderson marine), but the engine is still refusing to cool properly.
If anyone out there can offer a name, telephone number of someone reliable in the Cumbria area I would be ever so grateful.
Thanks in advance, Paul I.

spartacus · 06 January 2022, 19:22

I've reread the thread on this. Pictures would have been useful, given the combined knowledge of forum users. You'd be as well stick it on a pallet for someone to work on in their spare time with a budget for parts, given this is probably a labour intensive job to resolve. Whoever gets it will no doubt want to start from scratch anyway, water jacket off, head gasket off, check impeller, compression check, etc.

beamishken · 06 January 2022, 22:25

Quote:

Originally Posted by 57paulimo

Hi, as per my messages last year I have the above engine which I'm really struggling with.
I need professional advice as to where to go next. I've changed so many parts ( big thanks to Davie @ David Anderson marine), but the engine is still refusing to cool properly.
If anyone out there can offer a name, telephone number of someone reliable in the Cumbria area I would be ever so grateful.
Thanks in advance, Paul I.

You've been dealing with the best man for the job take a ride up & drop it off or put it on a pallet .afaik theres no one around the lakes or northern England thats particularly good. All the lakes guys have life too easy with all the boats that never go anywhere with wealthy owners willing to pay over the odds for services so they dont like hard work like this.

Sent from my SM-G950F using RIB Net mobile app

ollyit · 07 January 2022, 08:47

I've rebuilt that exact engine last summer ,happy to lend an ear

Davie · 08 January 2022, 08:43

If you canny get it sorted by March call me. Got a lot on my plate atm with windfarm jobs and a lorry load of new engines need fitted before I take on anymore + your boat needs water tested so need better weather. Ta

57paulimo · 12 January 2022, 10:52

Quote:

Originally Posted by ollyit

I've rebuilt that exact engine last summer ,happy to lend an ear

Thanks for the help guys.
To put it in a nutshell, the engine starts first, second time every time on the key, I'm assuming (perhaps wrongly ) that the engine running is fine, and that the fundamental issue is cooling.
A. Changed impeller, water pump housing and seals below the pump, gaskets also.
B. Inlet jacket off, inspected and put back together with new gaskets.
C. Exhaust manifold off, inspected, put back together with new gaskets.
D. Thermostat out, thermostat in, new thermostat and gaskets.
E. New spark plugs.
F. Fitted hose pipe onto water uptake and ran the engine, still overheating.
I've now got three stripped threads in the exhaust manifold which I'm in the process of repairing, gonna try to measure temperatures at various points with the engine running, but haven't done a compression test yet.
One thing I've not done is to fit an electric drill onto the driveshaft and put muffs on the water intake grills to simulate the engine running as I cant get my (three ) cordless drills to fit the socket I've taped to the top of the driveshaft.
Hope that explains where I'm at.
A despondent Cumbrian (Lancastrian really)!

Oldman2 · 12 January 2022, 22:15

Whittle a short bit of wood down from square one end for socket & round and small enough to fit in the drill chuck on tother.
Thats quick & dirty

A1an · 13 January 2022, 15:33

When you say its overheating... is the alarm going off?

matata · 13 January 2022, 16:54

Haven't read your original post/thread......Why do you think its overheating?

wgc851 · 14 January 2022, 08:52

your welcome to give me a call

57paulimo · 11 March 2022, 16:19

Quote:

Originally Posted by matata

Haven't read your original post/thread......Why do you think its overheating?

Hi, sorry Matata just got round to coming back onto the forum.
Basically when the engine is running, when/ if water is coming from the tell tail it is so hot it's almost steam. The overheat alarm goes off and I turn the engine off.
Been investigating the water pump just lately, managed to attach a power drill to the drive shaft, and a hose via muffs.
It seems one problem is a gasket below the water pump, which is leaking, I hadn't noticed this before but it's a generic part and isn't doing its job and the pump obviously isn't working at full capacity.
Really struggling to find the correct part, as the Yamaha Parts list doesn't cover my engine........

57paulimo · 11 March 2022, 16:22

Quote:

Originally Posted by Davie

If you canny get it sorted by March call me. Got a lot on my plate atm with windfarm jobs and a lorry load of new engines need fitted before I take on anymore + your boat needs water tested so need better weather. Ta

Davie, can you please respond to my emails.
Ta, Paul.

57paulimo · 11 March 2022, 16:31

Quote:

Originally Posted by ollyit

I've rebuilt that exact engine last summer ,happy to lend an ear

Hi Ollyit, just got back on the forum. Thanks for the help, I'm really struggling to get parts for my engine.
What is the serial number of your engine ? I cant seem to find the exact year of mine. The plate reads,
70BETO 6H3 L 474471.
From what I can understand 70 is the HP, B is inshore use, E is electric start, T is tilt and trim, no idea what the O denotes?
Don't know what the 6 is, or the H, 3 is the number of cylinders.
L is long shaft. That's where I'm at!
Cheers for your help.

Davie · 12 March 2022, 06:48

Quote:

Originally Posted by 57paulimo

Davie, can you please respond to my emails.
Ta, Paul.

Just seen the pictures and that will never work. I will sent you my mobile number call me today before noon so I can get the correct parts away to you

Smagu · 18 March 2022, 23:14

Not sure if it helps. Had a similar issue with my 1984 Yamaha 80hp. Took the head off and pretty much all around the cylinders was caked in salt. My tel tale was super strong. But obviously only half the cylinder getting cooled.

57paulimo · 07 September 2022, 21:45

Hi, thanks for your help. I had issues with the engine overheating and alarm sounding. Every cover was removed, all waterways cleaned and new gasketsfitted everywhere, still the problem existed. Turns out it was a cracked waterpump housing!
Weeks of work to strip, check and reassemble! It's not the problem.
Paul