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Generator Engine Swap #5415487 04/28/20 10:51 AM
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doolah02 Online Content OP
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Looking to replace engine on 22 year old Generac generator.
It has a 10 hp Briggs & Stratton engine. Any suggestions would be welcomed.

Re: Generator Engine Swap [Re: doolah02] #5415493 04/28/20 10:54 AM
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CT8 Online Content
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What is wrong with the old engine?


2015 F150 2.7
2018 F350 6.2
Re: Generator Engine Swap [Re: doolah02] #5415496 04/28/20 10:59 AM
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spasm3 Offline
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The issue for you may be that a lot of generator engines had tapered shafts vs straight shafts.


13 elantra 84k 5w30 synpwr
03 chevy avalanche 83k synpwr 5w30
17 mazda cx-5 19000 miles m1 0w30
Re: Generator Engine Swap [Re: CT8] #5415500 04/28/20 11:07 AM
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doolah02 Online Content OP
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Nothing is really wrong with it, just thought of swapping for a new one. After all it's
22 years old. I bought it in 1998.

Re: Generator Engine Swap [Re: doolah02] #5415510 04/28/20 11:15 AM
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Donald Online Content
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Originally Posted by doolah02
Nothing is really wrong with it, just thought of swapping for a new one. After all it's
22 years old. I bought it in 1998.


Yes - but how many hours on it?

Yes it will probably have a tapered shaft. Hard to get apart.


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Generator Engine Swap [Re: Donald] #5415523 04/28/20 11:35 AM
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doolah02 Online Content OP
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It didn't come with an hour meter but I would guess it has 800 and 900 hrs.

Re: Generator Engine Swap [Re: doolah02] #5415532 04/28/20 11:41 AM
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UncleDave Online Content
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Sounds like a lot of work for no specific reason.

UD


Uncle Dave
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Re: Generator Engine Swap [Re: UncleDave] #5415538 04/28/20 11:47 AM
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doolah02 Online Content OP
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Just an idle thought.

Re: Generator Engine Swap [Re: doolah02] #5415548 04/28/20 11:54 AM
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Soggydog Offline
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My neighbor ran a new Briggs and Stratton (7500watt??) storm responder generator with no oil and it kicked a rod out of the crankcase. He called around a replacement engine was 3/4 of the price he paid for the generator new.
He gave it to me and I disassembled it. I found a local mower shop that had a suitable replacement engine but it was $350. I see these generators selling for $200-$500 In running condition on Facebook and craigslist. Couldn't justify spending the money on it.

Last edited by Soggydog; 04/28/20 12:09 PM.

Currently running...
2011 Ford F250 4x4 6.7L, 2011 Toyota Camry SE 2.5L, 2002 Dodge Caravan 3.3L,
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Re: Generator Engine Swap [Re: doolah02] #5415569 04/28/20 12:17 PM
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hatt Offline
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Originally Posted by doolah02
Nothing is really wrong with it, just thought of swapping for a new one. After all it's
22 years old. I bought it in 1998.

Why do you think the rest of machine is in better shape than the engine with nothing wrong with it?

Last edited by hatt; 04/28/20 12:17 PM.

2013 F150 5.0, Delo 400 SD 15W-30, Wix 57502
2010 Camry 2.5, PP 10W-30, Mobil1 M1C-251A
Re: Generator Engine Swap [Re: doolah02] #5415579 04/28/20 12:26 PM
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Do a compression check on it and if it has good compression just check the gaps of the valves and adjust them if required. Check to see if you have to buy any gaskets before opening it up for the valve check / adjustment. Maybe put a new spark-plug in it and run it for hundreds of more hours.

If you are set on improving the reliability of what you have for a generator it might be best to just buy a new gen-set and store it unused and put the hours on the one you have now until it dies. The downside of doing this is that you may have to flash the generator if it looses the residual magnetism from sitting too long. Sometimes that happens, and other times they sit for years and still produce power with no problem when used.


Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa

Re: Generator Engine Swap [Re: hatt] #5415580 04/28/20 12:26 PM
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doolah02 Online Content OP
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Never thought of that way, as stated earlier it was just a thought.

Re: Generator Engine Swap [Re: doolah02] #5415633 04/28/20 02:00 PM
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AandPDan Offline
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I wouldn't change it just because either. My current generator was built in 1971 and still has the original 7hp Briggs and Stratton engine. It started out as a construction generator so has had a lot of hard use.

Now, it rests in a shed until need for power outages. It's been running on propane the past 10 years and just last year to electronic ignition.

Re: Generator Engine Swap [Re: doolah02] #5415657 04/28/20 02:25 PM
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Ive had my Generac also for many years that got me through the big east coast power outage. If the motor still runs and doesn't burn oil it is fine Get an hour meter and install that and keep the oil changed based on hours. then move on

Re: Generator Engine Swap [Re: doolah02] #5415859 04/28/20 06:13 PM
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I agree with the above, finding a GOOD replacement engine (not chinese junk) will be quite expensive. The money/time would be best spent going through your current one and replacing tune-up parts like air filter, oil, spark plug, etc. If it is pull-start, look at the rope to make sure it isn't fraying and won't snap on you at a bad time. Check the fuel lines, filter, and tank to make sure they are clean and in good condition.

My generator is a 1988 Coleman with a Briggs 8HP flathead. It's loud, and not the most efficient on fuel, but it runs perfect and consistent.


1998 Jeep Wrangler Sahara 4.0L/5MT (157k) - PHM 10w30, Wix 51085
2009 BMW 328i N51 (61k) - Liqui Moly 5w40, MANN HU816X
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