Horse'n Around 22 #1 Posted January 31, 2010 I really need some advise,I have been working on the Frankenhorse that my Dad left me when he passed away. I couldnt get it to start,I even primed it with a small amount of gas in the plug hole.It has good spark and I even put a new plug in it because I have found that a plug can fire when out of the engine but not under compression. It has a K181S in it and it has not been started in a good 5 years. Today as I was working on it to get it running, I hit the starter button I noticed that the dipstick would pop up in the tube with the first revolution and there is a lot of blowby. Also I saw some oil on the points so I figured that the breather could be plugged so I checked it and it appears ok. Also as I was trying to start it I noticed that I could smell a faint gas smell in the fumes coming from the dipstick tube from when I primed it.So just to be sure,I checked the oil and there is no gas in the oil, so the only thing I can think of is that the rings might be stuck from sitting allowing a ton of blowby. How can I check to see if its stuck rings without tearing it apart. Just in case they were or are stuck,I removed the head and filled the cyl with a 1/4 inch of marvel mystery oil. After a while it had seeped slowly thru. I wanted to test the compression but how can I do that with the automatic compression release bleeding off compression while its being rotated by the starter? One last thing, the last time it was run it ran great, it have any blow by to speak of and it didnt burn oil or have any nasty noises. I would really appreciate any advise you can give me. Thanks , John Share this post Link to post Share on other sites
TT-(Moderator) 1,162 #2 Posted January 31, 2010 Did you check both valves to see if they're seating? Share this post Link to post Share on other sites
WHC-125 4 #3 Posted January 31, 2010 Did you check both valves to see if they're seating? Kind of sounds like the exhaust valve is getting stuck open :thumbs: Share this post Link to post Share on other sites
Docwheelhorse 2,740 #4 Posted January 31, 2010 Hi--just the opposite Chris... He has a valve that is stuck open. The only way a valve "sticks" closed is if the cam is broke. I would pull the head and it will be quickly evident... Then soak the valve stem with penetrating oil or diesel/home heating oil or Marvel Mystery and gentle tap the valve. Rotate the piston until the valve that is stuck open should be closed... I.E. if its the intake you rotate the engine and wait to see the exhaust valve open and close. Then when the piston goes down you know the intake WOULD be open. The next stroke up would be compression so both valves would be closed---tap it gently then and it should seat. Repeat this several times and you should be okay to button it up and start it. Then run a touch of Marvel in the gas and it should work the kinks out itself. Good Luck Tony Share this post Link to post Share on other sites
WHC-125 4 #5 Posted January 31, 2010 Hi--just the opposite Chris... He has a valve that is stuck open. The only way a valve "sticks" closed is if the cam is broke. I would pull the head and it will be quickly evident... Then soak the valve stem with penetrating oil or diesel/home heating oil or Marvel Mystery and gentle tap the valve. Rotate the piston until the valve that is stuck open should be closed... I.E. if its the intake you rotate the engine and wait to see the exhaust valve open and close. Then when the piston goes down you know the intake WOULD be open. The next stroke up would be compression so both valves would be closed---tap it gently then and it should seat. Repeat this several times and you should be okay to button it up and start it. Then run a touch of Marvel in the gas and it should work the kinks out itself. Good Luck Tony Tony, I fixed myself. Thats what I meant to say, its been a long week And I couldnt have said that better myself! Share this post Link to post Share on other sites
Horse'n Around 22 #6 Posted January 31, 2010 Both valves are opening and closing freely.The only time when a valve stays open a slight bit is when the compression release cycle is doing its thing.I looked at both the valves and seats and the seating surfaces on them look to be in nice shape, but I will take a better look at them I could easily have missed something. Im going to take a better look at the valves and seats and I'll let you know what I find. Thanks for your help, John Share this post Link to post Share on other sites
rickv1957 75 #7 Posted January 31, 2010 I have heard engine can be turned over backwards to check compression,Rick Share this post Link to post Share on other sites
Docwheelhorse 2,740 #8 Posted January 31, 2010 HI--I think the turn it backwards to check compression thing only pertains to Briggs motors... I could be wrong thou. Tony Share this post Link to post Share on other sites
TT-(Moderator) 1,162 #9 Posted January 31, 2010 Spinning a Kohler backwards would theoretically work, but I won't do it. The spoiler tab on the camshaft is angled slightly to give it a "leading edge" as it passes under the lifter / follower. I don't think anything would catch to cause the tab to bend, but it's designed to rotate one way and I won't take that chance. I'll continue to do the V belt between two engines or just back the clearance off on the exhaust lifter on the big blocks. Share this post Link to post Share on other sites
pfrederi 18,696 #10 Posted January 31, 2010 Do a leak down test. It will ID Valves vs rings. Leak down testers are getting cheaper($30-40) after all you do not need a pro unit...but you do need compressed air. Share this post Link to post Share on other sites
can whlvr 994 #11 Posted January 31, 2010 i like yhe the two engine tricks,i have gotten motors that have been sitting for more than a decade going and it works for compression tests as TT already stated,thats if u have another motor . Share this post Link to post Share on other sites
