Oil Pump issue + No compression - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 5 (permalink) Old 03-31-2014, 02:19 AM Thread Starter
Ndr
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Oil Pump issue + No compression

OK, so was pretty much on the tail end of my rebuild, got everything back together and ready to start. Attempted to fire up the bike and nothing. Cranks fine, got spark, fuel and air going in...

1st issue I need to fix:
Seems that my oil pump lost it's prime after putting everything back together and sitting for awhile. Notice I wasn't getting any oil coming through when I took the head cover off and saw how dry it was after several attempts to crank/start the engine.

took the oi filter off and it is still dry and empty. Cranked the engine with the filter off. Not getting any oil coming up and out of the spout.

Can I get the pump to prime by pouring oil down the tube the oil filter attaches to?

This is the only thing I can think of to get a prime on the pump without splitting the case again.

2nd
I've got no compression on the rear cylinder.

I suspect that I may have messed up the timing and will be giving that a double check when I get home from work in the morning.

I'm pretty sure it's not the rings as I've got brand new ones on the piston, same as the front and that's fine. Also, the valves are freshly lapped and ground smooth and clean. Did a leak test with some alcohol when I had the heads on my bench and nothing leaked past the valves. They have all new oil seals as well.

So, this leads me to believe that it's a timing issue... I guess I'll find out soon enough.

......I'd rather wake up in the middle of nowhere then in any city on earth.

*2014 VN900 Custom (16,200 miles and counting)
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post #2 of 5 (permalink) Old 03-31-2014, 02:30 AM
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The upper timing chains are tricky in these....mine jumped a tooth once on the front and drove me nuts.....Im guessin its yer timing chain though....if it jumps 2 teeth, no comp....1 tooth, slight comp....

These engines suck....they should have pushrods......I never had ANY issues with my Harley motors....well, I needed to clean out my pushrods once.....gee, soaked em in gas overnight then blew em out....these modern bikes....too finicky.....and the chains stretch, and the ACCTs fail.....

Are they bad bikes, no....ya just gotta fix the dumbass engineering goofs.......JERRY......lolol




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post #3 of 5 (permalink) Old 03-31-2014, 10:12 AM
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I believe the oil pump is below the oil level, no prime necessary.
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post #4 of 5 (permalink) Old 03-31-2014, 10:23 AM
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Might be the hydraulic lash adjusters aren't pumped up, valves don't open, no compression.

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post #5 of 5 (permalink) Old 04-01-2014, 11:06 AM Thread Starter
Ndr
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Quote:
Originally Posted by wmsonta View Post
I believe the oil pump is below the oil level, no prime necessary.
The clymer manual does state that if you dissemble the oil pump to fill with oil to prime it when putting it back together. My engine say on the bench for awhile after reassembly waiting on paint to get finished, which is why I thought perhaps it lost it's prime. Though I believe you are correct about the pump being below the oil lever line, so it does make sense that it *shouldn't* need to be primed.


Quote:
Originally Posted by Spockster View Post
Might be the hydraulic lash adjusters aren't pumped up, valves don't open, no compression.
This makes a lot of sense. I'll try bleeding the HLAs again to see if that helps.

Thanks guys.

......I'd rather wake up in the middle of nowhere then in any city on earth.

*2014 VN900 Custom (16,200 miles and counting)
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