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Lycoming hard to start when hot?

R

rost495

Well-known member
Again,thanks in advance. As my friend runs his used boat, we are finding some things out.

It acts like my old 51 Dodge...starts fine when cold, run it till hot and you have to let it cool down sometimes, it can barely turn over a bit.

Felt the starter motor and it was not hot at all. This after running around for maybe an hour max.

It is a Nissan starter for a small car though......

Thanks, Jeff
 
Sounds like your friend needs to stop by an airport and let an aircraft mechanic check that engine out. Does it turn over when it is hot with the magnetos off? Does he have a cylinder head temp gauge to see just how hot it is? Sounds like a magneto overhaul is in order. The boat I have now had starting problems when it was hot. Overhauled the mag and all the problems went away.
 
NEED MORE INFO ON THE ENGINE , IS IT CARB. OR FI ........BUT I WOULD START SIMPLE AND CHECK MY GROUNDS , IVE SEEN IT HAPPEN TO MANY TIMES...
 
on my boat i get the engine turning and then turn the mags on, if i turn it off and then try to start it with mags on then it will act like it cant turn the engine over i have heard it called a "hot start" like i said i start the engine with the mags off as it starts spinning flip the mags on
 
Thanks for the info, its carbed motor. DOn't know about temps.

It spins over fine when cool. When hot its hard to get the prop spinning.

Will pass along the info on the mags and the trick on spinning cold, and then going hot!

THanks Tons! Very few sights on the net with as much quick and friendly help around!

Jeff
 
Sounds like mags to me Def. mine did the same thing i just recently had lacey everett rebuild the whole motor from the ground up and it doesnt matter how hot it gets, starts right up with no prob at all. Check the mags, they might be tired. Just a thought
 
my buddy's liecoming 160 with the liecoming starter did the same thing.start fine when cold ,but after pounding the ground and shut it off it would not start.had to let it cool off to get it to start.put new starter on it solved the problem.that's why i run a trusty old Continental i have never not been able to start my boat hot or cold. gotta love those continental and hate them crappy liecoming.i was told by a mechanic that any old idiot can build a liecoming but it take a true mechanic to build a continental
 
Woody

Then I'll make sure I get a Lycoming for sure, I"m way far away from a real mechanic and couldn't handle a Continental at all then. Just a shade tree. Lycoming sounds just right.

Really kidding though, I"d take either, but since I'm watching whats going on with my friends, why learn twice....

Anyone got any figures on MPG type thing or Gallons per hour?
 
My HIO-360 wouldnt start hot when I got it, a starter rebuild and good cable ends fixed that.

ABOUT STARTERS: Remember in my case I have a 360 CID engine, I wouldnt try to start my 350 CID truck with a 4.3 litre starter. Takes the right starter to crank them around.

Some hot hard starting can be timing and gas too.

Point in case. I got my kid a little new 90 HP 4 cylinder GPU boat for his first one. No starter or electrical system. Hand Prop only. Wouldnt start hot, in fact dry running it would get so hot it started cowing back. I gave it a Slick50 treatment and it ran so cool you could lay your hand on the fins after a good dry run and not get burned. Never had another hard to start problem with that engine ever. Could be unique fix to THAT engine or could be more wide application, thats for others to think about. Some like additives and some don't. Gotta make up YOUR own mind.

Scotty
 
I should have been a bit more clear also, but ALL the info is great.

Its hard to turn over, not hard to start really. When cool the prop spins good. When hot the prop barely makes half and full rotations...

If that makes more sense.

Jeff
 
i have both boats a 0470 and 170 angle value i like them both.but if i was going to spend the money on a new 6 banger i would have to go with a 0520 or 0550
 
I have encountered this problem too, especially when I have run the engine hard. I have found that after a hard run if you will run the engine at idle for a few minutes to cool it off it will crank much easier. This is standard procedure for some heavy equipment. I have two Continentals and a Lycoming all are very good reliable engines if taken care off and operated properly.
Gerry
Airboat, Rivermaster, 220 GPU
J-3 Cub, C-75
RV-9, 0320E2G
 
Windgator I work at a FBO and i notice when guys dont idle for a minute before shutdown they have a hard time starting back up.
 
Rost495, Back to your friend's boat's preventive maintenance history...no way to know. Hard starting is often a battery cable failure. Mine was a hidden bad primary ground. He should make certain his cables are large gauge, have very tight terminal ends that are swedged properly and they should be hooked up to a strong battery. Your previous posts indicate mags that need refreshing, once the mags are tuned up, good cables are attached...the hot starting issue should go away.
 
Thanks for the input.

All battery cables are large, and connetions are new. Only thing not checked is the engine block ground as to being clean.

Batteries are brand new. Dual batteries to start engine.

I'm noting and passing along, let it cool at idle for a few minutes.

Mags are most likely an issue.

Jeff
 
mags won't make an engine hard to turn over.. I've had similar problems on two boats and if your sure that you have good battery connections everywhere then I would swap starters.
 
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