Rebuilding my Penta 2002 that wouldn't turn over
- Thread starter Contest1
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RichardS
N/A
Is it the lowest ring, usually for oil control? If it's the standard fitment then a replacement will be in the ring set.
Richard
Richard
stevie69p
Well-Known Member
I'm in the middle of a stripdown and rebuild of a 2001, and haven't come across anything that looks like that. The oil control ring is the same diameter as the compression rings and has a spring coiled in the middle of it.
Contest1
Well-Known Member
Definatly not the oil, lower, ring.
Came from the top undercut and the top ring is same diameter externaly but biger inside and narrower than the second ring . Looks like a replacable spacer so hope its part of the kit.
Came from the top undercut and the top ring is same diameter externaly but biger inside and narrower than the second ring . Looks like a replacable spacer so hope its part of the kit.
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RichardS
N/A
I'm very confused .... but that's not so unusual.
By "undercut" do you mean ring groove ..... and if the larger ring in your photo is the top ring, how can the small diameter spacer ring, or whatever it is, fit in the same groove as the much larger ring next to it? Is it stretchy ... and if it is, how has it taken up a hexagon shape for the photo?
Richard
earlybird
Well-Known Member
Dim and distant memory says that these spacer rings were fitted to reduce piston slap in a cold engine. Could be wrong though, and hardly a benefit in an old VP diesel!
Perhaps now old technology with present-day low expansion alloys.
I think the apparent small diameter in the photo is the result of the gap allowing a large overlap.
Might be re-useable if a new one isn't provided.
Perhaps now old technology with present-day low expansion alloys.
I think the apparent small diameter in the photo is the result of the gap allowing a large overlap.
Might be re-useable if a new one isn't provided.
RichardS
N/A
Ahhh .... I see what you mean. The flat sides have overlapped at the bottom but when it's stretched out in the groove the 7 corners push out the ring to maintain better contact with the bore. I can see how that would work to enhance the natural springyness of the ring but I've never seen anything like it in a petrol engine.
As you say, if there isn't a new one supplied I would just use the old one.
Richard
stevie69p
Well-Known Member
I have just fitted a new set of rings into a 2001 today (same piston as 2002), and there wasn't anything resembling the photo. There was an oil control ring, a 2mm compression ring in the middle, and a 1.75mm compression ring at the top. And those rings are a snug fit...
Contest1
Well-Known Member
Thanks
Think thats about right. One of these in the other piston also.
Don't see them on the website so likely have to reuse unless the new top rings are made deeper to fit without these spacers.
And I did refere to the ring groves as undercuts. Just a throwback to my days as an apprentice fitter turner.
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Heckler
Well-Known Member
Be careful fitting the old bits plus the new ones, the ring land depths are critical, you need to break one each of the old ones and use the broken sharp end to clean/scrape out the carbon. If you dont the rings could concievably not close up enough to be flexible once the piston is fitted in the bore.
Stu
stevie69p
Well-Known Member
Have just been in that exact scenario with the 2001. When I tried fitting the compression rings, both wouldn't seat properly at one side of the piston. I thought I had got all of the carbon out, but obviously not, so the rings had to come back off and more scraping out was needed. I then used the outer part of the new ring and rolled it around the circumference of the piston to make sure it was seating fully before re-fitting them.
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Contest1
Well-Known Member
Absolutely! That's how I found the spacer
Contest1
Well-Known Member
stevie69p
Well-Known Member
On the copper pipe coming out of the water pump, take a long-ish hose up to the anti syphon valve, then another hose back down to the copper pipe that goes into the cylinder head.
VicS
Well-Known Member
The anti -siphon loop replaces the water pump discharge hose.
You may choose an alternative to the VP vacuum valve but this diagram shows how and where the loop is made and connected.
The top of the loop should be at least 40cm above the waterline ( Vetus recommendation) IIRC Beta recommendation is more
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skip50
Well-Known Member
The anti -siphon loop replaces the water pump discharge hose.
You may choose an alternative to the VP vacuum valve but this diagram shows how and where the loop is made and connected.
The top of the loop should be at least 40cm above the waterline ( Vetus recommendation) IIRC Beta recommendation is more
Yes that's just how I did it (on a VP 2003).
Contest1
Well-Known Member
Thanks all for the info. Looks managable
Contest1
Well-Known Member
pvb
Well-Known Member
Perhaps it's much older than the others.
Contest1
Well-Known Member
No progress.
Parts arrived from Marine Parts Europe with wrong bearing in the main bearing kit.
They say they cannot supply the correct kit untill July.
Tried a local Penta agent. Says he can supply but cannot return if same problem occurs unless I wait untill June.
Any one know were I might get the 875750 kit as outlined in the diagram.
The flanged bearing is the old one. The other is as supplied as part of the kit. Obviously not as per the diagram which come from the online penta 2002 parts catalog. Incidential both shells carry the same part number 840307?
Parts arrived from Marine Parts Europe with wrong bearing in the main bearing kit.
They say they cannot supply the correct kit untill July.
Tried a local Penta agent. Says he can supply but cannot return if same problem occurs unless I wait untill June.
Any one know were I might get the 875750 kit as outlined in the diagram.
The flanged bearing is the old one. The other is as supplied as part of the kit. Obviously not as per the diagram which come from the online penta 2002 parts catalog. Incidential both shells carry the same part number 840307?
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