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cub cadet xt1 lt42b brigs and Stratton engine struggles turning over and struggles starting

#1

R

randarrington

I've got a 3 year old lawn tractor and by the second year I noticed that it started to struggle turning the engine on the start. Once it had started then there wasn't an issue. Now, however, it seems to have gotten worse. The motor will turn once and then struggles to turn again. Holding down on the key will eventually (until the battery dies) turn it again but it's not fast nor consistent enough to fire the engine. I thought it was the battery since it seems to drop below 10 v when I turn the key. So the check this, I tried jumping from my car batter which produced the exact same performance. Sometimes I'll hear a high pitch whine as it struggles to turn the engine. I'm guessing it's either the solenoid or a bad starter. I did hear that the belts on the deck could be tightening and causing additional resistance. I'm not sure how to even check that. Does anyone have any advice please?


#2

R

randarrington

Oh also the engine is really hard to turn past the pressure point. I'm hoping it's something other than bad valves....


#3

ILENGINE

ILENGINE

If this is a single OHV briggs engine most likely either the valves are out of adjustment or the camshaft compression release is broken, or both.


#4

H

hlw49

Holding the key when it is hard to turn over can burn the starter up. Adjust the valves and try again.


#5

A

Auto Doc's

Hello R,

Welcome to the blog.

We need the number information stamped in the valve cover. If problems are with the rider itself, we would need the product label information.

Your description is a classic sign that the valves are out of adjustment after breaking wear.

The repeated straining of the starter has also likely overheated the starter windings, so it may need a starter.

There are lots of good You Tube videos about how to adjust the valves.

If it has broken the compression release, the engine will have to be removed and the camshaft replaced.


#6

Tiger Small Engine

Tiger Small Engine

randarrington said:
I've got a 3 year old lawn tractor and by the second year I noticed that it started to struggle turning the engine on the start. Once it had started then there wasn't an issue. Now, however, it seems to have gotten worse. The motor will turn once and then struggles to turn again. Holding down on the key will eventually (until the battery dies) turn it again but it's not fast nor consistent enough to fire the engine. I thought it was the battery since it seems to drop below 10 v when I turn the key. So the check this, I tried jumping from my car batter which produced the exact same performance. Sometimes I'll hear a high pitch whine as it struggles to turn the engine. I'm guessing it's either the solenoid or a bad starter. I did hear that the belts on the deck could be tightening and causing additional resistance. I'm not sure how to even check that. Does anyone have any advice please?
Click to expand...
First charge and load test battery. Second clean and check all terminals for tightness. Could be one of several problems, but always start with the battery.The high pitched whine you hear is the starter slowly being killed. You can always turn the engine past the compression stroke by hand, short term, to get it started


#7

Craftsman Garage

Craftsman Garage

No doubt, yours broke the compression release.


#8

R

randarrington

Thank you all for the replies. I had a shop come and pick it up today. I don't have anything that I'd need to adjust the valves so I opted to let a pro do it. I had come to the conclusion that it's probably the valves. Sounds like I may have destroyed the starter too. Sigh. The mower is only a 3 years old.....Needless to say, I may never buy a cub cadet product again.


#9

woodstover

woodstover

randarrington said:
Thank you all for the replies. I had a shop come and pick it up today. I don't have anything that I'd need to adjust the valves so I opted to let a pro do it. I had come to the conclusion that it's probably the valves. Sounds like I may have destroyed the starter too. Sigh. The mower is only a 3 years old.....Needless to say, I may never buy a cub cadet product again.
Click to expand...
Yearly maintenance prevents 90% of problems. Read your owners manual and follow the recommended maintenance schedules. Valve adjustment is just one of many maintenance items that is required after a certain amount of hours (which is listed in your owner's manual) This is no different than having your vehicle maintained on a set schedule to ensure trouble free operation. Either learn to do it yourself or have a qualified person do the work if you want a reliable machine.


#10

Tiger Small Engine

Tiger Small Engine

woodstover said:
Yearly maintenance prevents 90% of problems. Read your owners manual and follow the recommended maintenance schedules. Valve adjustment is just one of many maintenance items that is required after a certain amount of hours (which is listed in your owner's manual) This is no different than having your vehicle maintained on a set schedule to ensure trouble free operation. Either learn to do it yourself or have a qualified person do the work if you want a reliable machine.
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One of the main reasons yearly maintenance prevents most problems is because you usually catch problems before they happen. Example: A drive belt that has cracks about every inch and needs to be replaced. Very few people seem to do yearly maintenance with their equipment, at least in my experience.


#11

woodstover

woodstover

Tiger Small Engine said:
One of the main reasons yearly maintenance prevents most problems is because you usually catch problems before they happen. Example: A drive belt that has cracks about every inch and needs to be replaced. Very few people seem to do yearly maintenance with their equipment, at least in my experience.
Click to expand...
Yup, unless they are using equipment to make money, they see the value in preventative maintenance.


#12

R

rhkraft

This is a classic valve adjustment issue. These engines have an extra mini lobe on the cam to partially open the exhaust valve when the engine is being turned over by the starter or rope. This is a compression release to make it easier to crank the engine. If the valve adjustment is too loose the cam won't open the exhaust valve enough to decrease the compression for easy cranking, and the compression is too high to crank over. The valve adjustment amount is very critical so read the specs (usually only .004-.005 ") When set right the engine will crank easily with the starter or a rope. This slight decompression is moot when the engine is running. I have fixed a lot of these. Even some where the owner put on a new starter without results. Good Luck!


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