[Bf7502006]

Hey i got 06 brute force 750 i put new timing chains on and i thought i did it right all the timing marks are lining up when i spin the crank the timing marks line up with when the piston is at tdc, but i have no compression i looked up a youtube video and did a leak down test this guy took the valve cover off so i did aswell and too my understanding that makes all the valves closed i ran air threw it and its flowing right out the exhaust i only checked the rear cylinder for now because i wanna know if im doing it right. Or if there is another reason why all the compression would be going out the exhaust with the valve cover off. Any help would be appreciated

 

[NMKAWIERIDER]

Removing the valve cover does nothing to the valve or it's lash. It's more likely you are on TDC of the exhaust stroke rather then the compression stroke. Do this- pick a cylinder, then remove both valve covers. Then rotate the engine until you see the intakes depress(go down), then continue slowly as they come back up. Once back up continue rotating while looking in the timing view port until you see the marker for the cylinder you picked line up with the casting marks..ie TR for the rear and TF for the front. Then check the lash on all valves. If any are tight or out of spec, correct them. You can lock the primary in place with a tire iron and do a leak down test on that cylinder now or...if you found one that was real tight, move on to the other cylinder and do the exact same procedure. If it still doesn't run we'll look at some other things.

 

[Bf7502006]

Sorry when i said valve cover i meant the cover covering the camshaft and that was the first thing i tried was with just the valves exposed turned the engine counter clockwise until exhaust valves opened then closed then intake valves and then line up the TR mark and could hear/ feel air coming out the exhaust so i pulled the cam cover off hoping that would close both valves and still had it coming out the exhaust.

 

[NMKAWIERIDER]

Sorry when i said valve cover i meant the cover covering the camshaft and that was the first thing i tried was with just the valves exposed turned the engine counter clockwise until exhaust valves opened then closed then intake valves and then line up the TR mark and could hear/ feel air coming out the exhaust so i pulled the cam cover off hoping that would close both valves and still had it coming out the exhaust.

From the primary side the engine normally turns clockwise...and taking the cap off while the chains are on with the tensioners are installed may lift the cam. Best not do that and best pull the tensioners and re-set them as per the manual.

 

[Bf7502006]

From the primary side the engine normally turns clockwise...and taking the cap off while the chains are on with the tensioners are installed may lift the cam. Best not do that and best pull the tensioners and re-set them as per the manual.

Oh sh*t ok ill reset the tensioners but do you have any idea what would cause compression to be lost threw the exhaust?

 

[NMKAWIERIDER]

Oh sh*t ok ill reset the tensioners but do you have any idea what would cause compression to be lost threw the exhaust?

Only one thing-valve is not seating. That could be because of several reasons such as a timing issue, set too tight, warped valve stem, binding in the guide, damaged or cracked valve seat...lots of things. If it was ever out of time by just two teeth..or one tooth and it was set a little tight, the piston could have touched it during overlap...thats when all valves are slightly open at TDC on the exhaust stroke and there is only about .030 clearance between the valves and the piston at best. If so it would have bent the head and now it won't seat. So..test it after going through the procedure above. If it still leaks out one of the exhaust valves, you have a problem and the head will need to come off. A borescope through the spark plug hole would be able to see a mark the valve left on the piston. It would be just a little half-moon ridge imprint.

 

[Bf7502006]

Okay looks like the heads are coming off will i need a new piston if it is marked or can i just replace the bent valves.

 

[NMKAWIERIDER]

Okay looks like the heads are coming off will i need a new piston if it is marked or can i just replace the bent valves.

IF..it only hit it once and just enough to slightly bend the stem, you might get away with not replacing the piston. And IF that pressure wan't enough to force all oil film from between the rod bearing and crank, there won't be a scuff mark and damage to the bearing and crank...but if there is, she will be on borrowed time.

 

[Bf7502006]

So your saying if there is a half moon shape on the piston most likely the piston crank and bearing will need to be replaced?

 

[NMKAWIERIDER]

So your saying if there is a half moon shape on the piston most likely the piston crank and bearing will need to be replaced?

Just saying if it hit hard enough..it's possible. But I assume you rotated it over without the plugs in before trying to start it and it had no interference so I wouldn't worry too much..by hand it would have stopped when/if it toughed the valve. If you just hit the starter without rolling it over by hand first...it may...or may not have hurt anything other then the valve. So..I assume you went through the stepa and it still leaks out the exhaust valves. Do you see an imprint on the piston?

 

[Bf7502006]

Im a rookie and didnt think about it but when this all started i was just doing a valve adjustment and when i spun the crank nothing spun with it and i could hear the chain spinning so i thought maybe 1 way besring or somthing didnt really know what was behind that cover so i hit the starter and everything spun and im guessing thats when i fucked it i just stuck a camera in there and it looks like atleast 2 out the 4 valves hit on both pistons. Whats next steps new valves new pistons and rings? Can i change the piston just popping the heads off? Also when i was trying to time it i was trying to remove the cooling pipe out the head and couldnt get it what sorta magic you gotta use to get that out? Also thanks again for all the help and advice!

 

[NMKAWIERIDER]

Well that does look like a multiple impact spot..Maybe it happened with the previous owner. Not sure what you mean by Coolant tube. There is an oil tube that runs from the case through the cylinder up into the head. That comes out with the cylinder. If it were mine and I knew all the rest was OK, I might be tempted to just do a valve job and put the head back on and run it. It didn't break the valve so it might be worth the risk. It's 100% up to you though.

 

[Bf7502006]

Okay i was thinking the same thing just do the valves. And ill attach a pic but im pretty sure its coolant

 

[NMKAWIERIDER]

Oh yeah..that is a coolant return. I thought they just has a retainer bolt holding a flange in with an O-rings on the end of the tube. You can see it in this pic:

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[Bf7502006]

Okay so once i remove that i can just pry on it and it should pop out?

 

[NMKAWIERIDER]

Okay so once i remove that i can just pry on it and it should pop out?

Supposed to. It may be rusted-in some. Just be careful..maybe WD-it first.

 

[Bf7502006]

Okay thanks again for the help im sure ill be back with more questions

 

[Bf7502006]

Im back again ahhhhh. With the lifter valve cover off so the valves are closed i have 36psi when i put the cover on i rotated the engine over by hand and didnt feel any resistance so im i know the valves arent hitting this time but i have no compression do you think i just need to re time it when i put the cam back on i rotated it until the TR mark was lined up then put the cam on lining up the marks with the hesd and the arrow straight up and i made sure the culinder was actually at TDC. Any ideas on what im missing?

 

[NMKAWIERIDER]

Im back again ahhhhh. With the lifter valve cover off so the valves are closed i have 36psi when i put the cover on i rotated the engine over by hand and didnt feel any resistance so im i know the valves arent hitting this time but i have no compression do you think i just need to re time it when i put the cam back on i rotated it until the TR mark was lined up then put the cam on lining up the marks with the hesd and the arrow straight up and i made sure the culinder was actually at TDC. Any ideas on what im missing?

If the crank is lined up with TDC in the window and the cam is set to the TDC side on the compression stroke, and the marks are aligned with the head's deck, it should be OK. If you do not have compression conform all the lashs are in spec then do the leak-down test. It is either going out the bottom past the piston and rings or out some valves. Just put it on TDC of the compression stroke, slip a bar through the primary to hold it, pull the dip stick, then put 30-50psi of air to it through a spark plug adapter and put your ear to it. You can hear where it's going.

 

[Bf7502006]

Okay i did try the leak down test with 40 and couldnt hear any air or feel any coming out anywhere with the lifter cover off so ill put it back on check the lashes and give that a go. Thanks