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> installing rings!, I found a crack in the piston wall.
JOE M
post Jul 24 2009, 11:43 AM
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I think I know the answer but hopefully I am wrong. I was installing new rings and found that 1 piston had a chunk missing from the wall (see pic). Is there any hope for this piston or is it dead.My guess is that it is trash but can I replace a single piston or do I have to replace all 4?

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underthetire
post Jul 24 2009, 12:02 PM
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QUOTE(JOE M @ Jul 24 2009, 10:43 AM) *

I think I know the answer but hopefully I am wrong. I was installing new rings and found that 1 piston had a chunk missing from the wall (see pic). Is there any hope for this piston or is it dead.My guess is that it is trash but can I replace a single piston or do I have to replace all 4?

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If one chunk came out, whats to stop more from coming out at 6K RPM. Plus i think you will break a ring. Junk IMO.
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Jake Raby
post Jul 24 2009, 12:11 PM
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Throw it away...
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JOE M
post Jul 24 2009, 12:37 PM
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man 1 thing after another. I cant catch a break.But the second part of my question was do I need to buy all new cylinders/pistons or just the 1?Regardless it sucks because im on a huge budget but I want to do what right.
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jcd914
post Jul 24 2009, 01:50 PM
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You do not need to replace the complete set of pistons, 1 piston knows nothing of the others. You will need a piston that matches you others though.
It will need to have the correct piston to cylinder clearance, the correct weight to match the rest and a matching dish, valve relief's, pin height and anything else that will affect the compression. You don't see a lot of single pistons for sale so it might be easier to just get a matched set.

Jim
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JOE M
post Jul 24 2009, 02:02 PM
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QUOTE(jcd914 @ Jul 24 2009, 12:50 PM) *

You do not need to replace the complete set of pistons, 1 piston knows nothing of the others. You will need a piston that matches you others though.
It will need to have the correct piston to cylinder clearance, the correct weight to match the rest and a matching dish, valve relief's, pin height and anything else that will affect the compression. You don't see a lot of single pistons for sale so it might be easier to just get a matched set.

Jim

I did see complete sets for 1.7 running around $200.It just sucks that I will need to buy a whole set.And on top of that my freaking windshield cracked last week.I started to pull off the molding and when I came home from work there was a crack.This freaking car is killing me but I am on a personal quest to get this thing running.I just dont have a ton of money so thats why I asked if there is anything that can be done for the piston.Deep down I already knew what the answer was but I guess I was hopping that someone would say something like that happens all the time--get a little jpb weld and your in business.LOL WISHFULL THINKING.
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jcd914
post Jul 24 2009, 02:42 PM
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Have you measured the piston to cylinder clearance?
Do you know which 1.7 pistons you have?
You could post a WTB ad with the info you have and maybe someone has a piston to match.
I have a set of 1.7 P&C's I'll never use but 3 of the 4 are still on the engine and it is VW 411/412 engine. I have no clue how those P&Cs would compare to a set for a 914.
Of my 3 914s the only one without a cracked windshield is the one without a windshield. (IMG:style_emoticons/default/sad.gif)

Jim
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Mark Henry
post Jul 24 2009, 02:49 PM
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I have two used 1.7 P&C sets (different dish) in OK condition. I may have a couple of singles, but I'd have to check.

Shipping a whole set (from Canada) costs about $70 I think.
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JOE M
post Jul 24 2009, 02:51 PM
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QUOTE(Mark Henry @ Jul 24 2009, 01:49 PM) *

I have two used 1.7 P&C sets (different dish) in OK condition. I may have a couple of singles, but I'd have to check.



Are you selling them?If so how much-----
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JOE M
post Jul 24 2009, 02:57 PM
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QUOTE(jcd914 @ Jul 24 2009, 01:42 PM) *

Have you measured the piston to cylinder clearance?
Do you know which 1.7 pistons you have?
You could post a WTB ad with the info you have and maybe someone has a piston to match.
I have a set of 1.7 P&C's I'll never use but 3 of the 4 are still on the engine and it is VW 411/412 engine. I have no clue how those P&Cs would compare to a set for a 914.
Of my 3 914s the only one without a cracked windshield is the one without a windshield. (IMG:style_emoticons/default/sad.gif)

Jim

So cracked windshields are common????
I did not measure the distance because they were already shimed.I probably should remeasure and shim if needed.To be honest the only in depth thing I know about this engine is that it a 1.7. It had real low compression when I bought it. So far I bought new carbs and now rings.
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Mark Henry
post Jul 24 2009, 03:05 PM
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QUOTE(JOE M @ Jul 24 2009, 04:51 PM) *

QUOTE(Mark Henry @ Jul 24 2009, 01:49 PM) *

I have two used 1.7 P&C sets (different dish) in OK condition. I may have a couple of singles, but I'd have to check.



Are you selling them?If so how much-----


$20 for my time....actual post charge.
BTW that's slow post, takes about 2weeks,
Just the 4 pistons shipping would be cheaper (or faster).

Post a pic of your tops, I'll see if I have the same, then you might have a couple extra pistons
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Mark Henry
post Jul 24 2009, 03:17 PM
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Ok I have a set of dish P&C, and just the pistons with a dome top.
I'm sure I had another set, but I don't see it.
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JOE M
post Jul 24 2009, 03:18 PM
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QUOTE(Mark Henry @ Jul 24 2009, 02:05 PM) *

QUOTE(JOE M @ Jul 24 2009, 04:51 PM) *

QUOTE(Mark Henry @ Jul 24 2009, 01:49 PM) *

I have two used 1.7 P&C sets (different dish) in OK condition. I may have a couple of singles, but I'd have to check.



Are you selling them?If so how much-----


$20 for my time....actual post charge.
BTW that's slow post, takes about 2weeks,
Just the 4 pistons shipping would be cheaper (or faster).

Post a pic of your tops, I'll see if I have the same, then you might have a couple extra pistons

I dont know if these pics help but here are a couple.

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JOE M
post Jul 24 2009, 03:20 PM
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1 more sorry.
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JOE M
post Jul 24 2009, 03:48 PM
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So is it possible to tell any details about this engine by pics I have posted?
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tat2dphreak
post Jul 24 2009, 03:59 PM
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the engine number is on top, by the oil filler, that's the only number that matters. (IMG:style_emoticons/default/sad.gif)
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JOE M
post Jul 24 2009, 04:03 PM
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w0114127 is the only number on top. Its actually by the back not the oil filler.
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tat2dphreak
post Jul 24 2009, 04:08 PM
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1.7 engine, early one

66x90mm
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JOE M
post Jul 24 2009, 04:10 PM
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QUOTE(tat2dphreak @ Jul 24 2009, 03:08 PM) *

1.7 engine, early one

66x90mm



Thanks not sure what that means. Any concerns with that.
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Mark Henry
post Jul 24 2009, 04:13 PM
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The top of your old piston....is it an innie or outie...dome or dish?
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