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Loose valve cup

#1

D

double yellow

Cub cadet Serl # 4706730603 kohlor 18 hp twin cam courage motor. Wan.t start do to a loose valve. Tried to tighten the nut that adjust the valve, but the nut will bottom out before the cap gets to where it is suppose to be. Real louse cap. acts like the stud is to long.
Pleasr help me with another problem


#2

F

Forest#2

Remove the rocker and compare that stud to the other one. It's either turned out or if pressed into the head it has got longer.
Compare it to the other one.


#3

StarTech

StarTech

For reference it is a Kohler SV541-3218.

It can be even a valve seat that came loose or could have inhaled a screw.


#4

S

slomo

Take pictures of what you are trying to say.

Sounds like a valve guide has moved maybe? Over heated the engine?

Engine on the wrong stroke to set the valves?

Need pictures please.


#5

D

double yellow

Forest#2 said:
Remove the rocker and compare that stud to the other one. It's either turned out or if pressed into the head it has got longer.
Compare it to the other one.
Click to expand...
Looks like the loose cap is the one with the long stud
Thanks


#6

D

double yellow

StarTech said:
For reference it is a Kohler SV541-3218.

It can be even a valve seat that came loose or could have inhaled a screw.
Click to expand...
It is the kohler SV541-3218 Is the stud screw nut threaded all the way through?


#7

D

double yellow

slomo said:
Take pictures of what you are trying to say.

Sounds like a valve guide has moved maybe? Over heated the engine?

Engine on the wrong stroke to set the valves?

Need pictures please.
Click to expand...
I will take some pictures as soon as I can . Push rod is still loose in the head when no pressure is on the rod. It appears the valve worked loose . Valve spring still compressers, when motor rotates by hand
Thanks for all help.


#8

D

double yellow

slomo said:
Take pictures of what you are trying to say.

Sounds like a valve guide has moved maybe? Over heated the engine?

Engine on the wrong stroke to set the valves?

Need pictures please.
Click to expand...
Motor is clean.


#9

sgkent

sgkent

I closed my eyes and tried to see it from here but my special Kent powers have failed me again in my old age. Need good photos.


#10

StarTech

StarTech

double yellow said:
Looks like the loose cap is the one with the long stud
Thanks
Click to expand...
Both studs are the same length so if one is sitting higher then the other one, it has backed out some.


#11

D

double yellow

StarTech said:
Both studs are the same length so if one is sitting higher then the other one, it has backed out some.
Click to expand...
I have not taken the other cap nut off to measure the stud. From looks they seem to be the same. Is the cap nut hollow all the way through?

thanks


#12

S

slomo

double yellow said:
I have not taken the other cap nut off to measure the stud. From looks they seem to be the same. Is the cap nut hollow all the way through?

thanks
Click to expand...
Are you taking about a rocker arm adjusting nut? What is a cap nut? Post up some pictures please of what you are saying. I'm lost.......


#13

D

double yellow

double yellow said:
It is the kohler SV541-3218 Is the stud screw nut threaded all the way through?
Click to expand...

slomo said:
Are you taking about a rocker arm adjusting nut? What is a cap nut? Post up some pictures please of what you are saying. I'm lost.......
Click to expand...
Yes the rocker adjusting nut.
I unscrewed the other adjusting nut on the other valve and measured the distance on the inside threaded adjusting nut and the one that came loose is shorter inside the threaded area than the other one, Seams like the loose one broke the tip off the threaded stud. Any idea of how to get the broken piece out. Studs are case hardened. Also what are the gap measurements of the valve. and which one is the exhaust valve?

Thanks


#14

D

double yellow

slomo said:
Are you taking about a rocker arm adjusting nut? What is a cap nut? Post up some pictures please of what you are saying. I'm lost.......
Click to expand...
The cap adjusting nut that screws on the stud to adjust the valves
thanks


#15

D

double yellow

double yellow said:
Motor is clean.
Click to expand...
Looks loike the hex screw had backed out some due to the cap adjusting nut being loose
Thanks


#16

D

double yellow

Any one know the valves gap on both valves Kohler motor Serl # 4706730603. twin cam


#17

C

craigr007

double yellow said:
Cub cadet Serl # 4706730603 kohlor 18 hp twin cam courage motor. Wan.t start do to a loose valve. Tried to tighten the nut that adjust the valve, but the nut will bottom out before the cap gets to where it is suppose to be. Real louse cap. acts like the stud is to long.
Pleasr help me with another problem
Click to expand...
these are adjustable. in the center of the rocker arm bolt. there is a Allen bolt. need to take a Allen wrench. and back it out a little. till it adjust it till it is ware you need it to be. do not need to turn it a lot. just play with it. and you can get adjusted to ware you need it to be.


#18

C

craigr007

craigr007 said:
these are adjustable. in the center of the rocker arm bolt. there is a Allen bolt. need to take a Allen wrench. and back it out a little. till it adjust it till it is ware you need it to be. do not need to turn it a lot. just play with it. and you can get adjusted to ware you need it to be.
Click to expand...
i work on cubs a lot. and all kohlers, briggs, and others are in fact adjustable


#19

C

craigr007

double yellow said:
Any one know the valves gap on both valves Kohler motor Serl # 4706730603. twin cam
Click to expand...
just set them around 6 thousands. it will work. can set it a little tighter if you want. but this is a good setting to make it run. but the twin cam has a compression release in them. it works on the exhaust valve. make sure it works. if not. you need to remove the top cover. and check the exhaust cam. check the spring on the cam. it works the part that releases the compression. if the spring is broke. need to get a new spring. it should fix it. can get a spring from cub dealer.


#20

F

Fuzzy1

I had an old KAWASAKI FD590V with similar symptoms. Turned out to be valves that were never/insufficiently hardened from the factory. The valves wore in such a way that there was no longer any material at the head, and they just sucked into the head, causing the pushrods to come off ...


#21

C

Curtisun

I have run upon several that the lifter was bad. If you remove the lifter below where the rounded washer sits is the hole the stud goes through, inspect that area for cracks or warpage. if it is cracked that allows the adjuster to get to end of treads before closing gap.


#22

D

double yellow

craigr007 said:
just set them around 6 thousands. it will work. can set it a little tighter if you want. but this is a good setting to make it run. but the twin cam has a compression release in them. it works on the exhaust valve. make sure it works. if not. you need to remove the top cover. and check the exhaust cam. check the spring on the cam. it works the part that releases the compression. if the spring is broke. need to get a new spring. it should fix it. can get a spring from cub dealer.
Click to expand...
Thanks very much


#23

D

double yellow

Curtisun said:
I have run upon several that the lifter was bad. If you remove the lifter below where the rounded washer sits is the hole the stud goes through, inspect that area for cracks or warpage. if it is cracked that allows the adjuster to get to end of treads before closing gap.
Click to expand...
Thanks


#24

D

double yellow

Fuzzy1 said:
I had an old KAWASAKI FD590V with similar symptoms. Turned out to be valves that were never/insufficiently hardened from the factory. The valves wore in such a way that there was no longer any material at the head, and they just sucked into the head, causing the pushrods to come off ...
Click to expand...
sounds bad. good luck


#25

D

double yellow

craigr007 said:
these are adjustable. in the center of the rocker arm bolt. there is a Allen bolt. need to take a Allen wrench. and back it out a little. till it adjust it till it is ware you need it to be. do not need to turn it a lot. just play with it. and you can get adjusted to ware you need it to be.
Click to expand...
fine thanks


#26

D

double yellow

Curtisun said:
I have run upon several that the lifter was bad. If you remove the lifter below where the rounded washer sits is the hole the stud goes through, inspect that area for cracks or warpage. if it is cracked that allows the adjuster to get to end of treads before closing gap.
Click to expand...
sounds like a Monday job maybe


#27

D

double yellow

craigr007 said:
these are adjustable. in the center of the rocker arm bolt. there is a Allen bolt. need to take a Allen wrench. and back it out a little. till it adjust it till it is ware you need it to be. do not need to turn it a lot. just play with it. and you can get adjusted to ware you need it to be.
Click to expand...
You were right. Thanks


#28

D

double yellow

craigr007 said:
just set them around 6 thousands. it will work. can set it a little tighter if you want. but this is a good setting to make it run. but the twin cam has a compression release in them. it works on the exhaust valve. make sure it works. if not. you need to remove the top cover. and check the exhaust cam. check the spring on the cam. it works the part that releases the compression. if the spring is broke. need to get a new spring. it should fix it. can get a spring from cub dealer.
Click to expand...
I know at times the starter acts like it has a drag on it. then fires up.


#29

D

double yellow

any one have a good used leaf bagging unit that will fit this mower LT1 18 HP twin cam


#30

D

dcohick

double yellow said:
I will take some pictures as soon as I can . Push rod is still loose in the head when no pressure is on the rod. It appears the valve worked loose . Valve spring still compressers, when motor rotates by hand
Thanks for all help.
Click to expand...
Bent push rod....


#31

D

double yellow

dcohick said:
Bent push rod....
Click to expand...
Hex nut had inside the cap nut had worked loose
Thanks


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