Author Topic: Engine rebuild supplies  (Read 12715 times)

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Pete126

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Re: Engine rebuild supplies
« Reply #45 on: April 14, 2019, 12:06:32 AM »
If you re-torque the head you need to reset the tappets as if their too tight the valves won't close giving you the same compression symptoms 
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Xylaquin

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Re: Engine rebuild supplies
« Reply #46 on: May 06, 2019, 04:45:49 PM »
Still no joy. Took it all apart again, even had the head skimmed, new gaskets all in place, valve clearances set correctly, pushrods definitely in the correct way. Put it all back together again and still... absolutely no compression on one cylinder.
The other cylinder has great compression though... so there's that.

Honestly about to give up.

Gadge

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Re: Engine rebuild supplies
« Reply #47 on: May 06, 2019, 09:48:04 PM »
Must be rings then surely  ::)
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nick7nick7

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Re: Engine rebuild supplies
« Reply #48 on: May 06, 2019, 10:12:53 PM »
Between us we have 2 cylinders running at full compression!

What's the compression like when the engine is warm?

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Pete126

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Re: Engine rebuild supplies
« Reply #49 on: May 06, 2019, 11:32:33 PM »
Sorry to hear you’re still having problems, has this engine ever run right? Is it spitting water out of the exhaust? When you had the head off did you check the two liners for cracks? I mention this because I used to own a Panda 4X4 which I assumed the head gasket had gone, I replaced it three times the fourth when I took the head off piston three was at the bottom of the stroke when I noticed a dark spot on the lower part of the liner which when inspected was a hairline crack  which opened up when it got hot, just another thing to check if you take the head off again 🙁
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ChrisRLewis

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Re: Engine rebuild supplies
« Reply #50 on: May 07, 2019, 12:13:40 AM »
It maybe worth checking if the piston liners are not sitting too high or too low in the crankcase.

Xylaquin

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Re: Engine rebuild supplies
« Reply #51 on: May 07, 2019, 08:42:18 AM »
What's the compression like when the engine is warm?
Can't really get the engine warm, as it's only able to idle (see my previous video in this thread). If I push the throttle it dies.

Must be rings then surely  ::)
Either that or a valve seat?

I'd be kinda surprised if it's a ring, surely if it were a ring I'd still get a little compression. Plus the first time I looked into the bore I could see it was holding up some liquid. If it's able to do that then I figured it sealed fine. But then again the ring could have a gap at the top.

Sorry to hear you’re still having problems, has this engine ever run right?
Yes... mostly. I mean the carb mixture was off, but I drove it 800 miles up the road a month ago.

Is it spitting water out of the exhaust? When you had the head off did you check the two liners for cracks?
Yes and yes. But the water coming out was residual from the spillage... I don't think it's perpetual.

nick7nick7

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Re: Engine rebuild supplies
« Reply #52 on: May 07, 2019, 09:20:49 AM »
What's the compression when warm? If it idles, then you will have a little temperature in it.

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nick7nick7

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Re: Engine rebuild supplies
« Reply #53 on: May 07, 2019, 10:26:10 AM »
Is it breathing heavy?
I had to disconnect the breather pipe return to the carb because mine breathes heavy

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Xylaquin

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Re: Engine rebuild supplies
« Reply #54 on: May 08, 2019, 06:25:49 PM »
Haven’t left it running long enough.

Compression is zilch and perfect.

Pete126

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Re: Engine rebuild supplies
« Reply #55 on: May 08, 2019, 09:54:48 PM »
Hi mate clutching at straws now, but I just remembered years ago that I had another problem after setting the tappets the engine was only firing on one cylinder after taking the rocker cover off I noticed that there was a patch inside the cover that looked like something had been touching the inside which aligned to the valves, the problem was that I over tightened the rocker cover so the valves on one cylinder were not closing. If the two holes are are sunk into the rocker cover with over tightening make them level also if the gasket is compressed too much this could be a problem, you can check this by removing the cover and do another compression check.
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Xylaquin

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Re: Engine rebuild supplies
« Reply #56 on: May 09, 2019, 07:27:45 PM »
Pete, it's so crazy an idea... but it worked!!

I slackened off the rocker cover and got compression back!
What an absolute quirk  :o

I do seem to have pushed in my rocker cover's holes as you mention, as I only got the compression with the rocker cover pretty-much off. When I put it back on and tighten it even slightly (just as much as is required to stop any oil drops) we're back to no compression again.

Now I've got a breakthrough it's time to get into my garage again to have another go.

Pete126

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Re: Engine rebuild supplies
« Reply #57 on: May 09, 2019, 08:02:48 PM »
That’s fantastic news Lachlan 👍 I read through the thread again last night and it jogged my memory, when you’ve adjusted the rocker box with a hammer from the inside make sure the gasket is in good condition, I stick the gasket onto the cover with silicone and leave to go off after pressing it down on a flat surface, when you’re ready to refit clean the head and smear a thin layer of silicone onto the gasket, when you tighten the nuts as soon as you see the silicone squishing out it’s tight enough 😉
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Xylaquin

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Re: Engine rebuild supplies
« Reply #58 on: May 24, 2019, 11:43:51 AM »
Well I’m back on the road, kinda.

Got the engine going on Wed, drove about fine. Drove home, parked up for the night.
The next morning it wouldn’t start until I’d re-set the timing.
Went to work, parked there for most of the day, once again it wouldn’t start until I’d re-set the timing. This morning, yet again it won’t start, and despite setting the timing three times just won’t fire into action.

I’m definitely screwing down the dizzy enough. Any ideas?

nick7nick7

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Re: Engine rebuild supplies
« Reply #59 on: May 24, 2019, 12:18:55 PM »
Sounding similar to my current issue.
I've had to change my timing to start, but when warm (obviously) it's out
Do I've set it in the middle.

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