saumon
Lieutenant
- Joined
- Aug 2, 2004
- Messages
- 1,452
Hi,
first of all, please excuse my english, as i'm french speaking.
i'm in the process of tearing down my engine (Merc 60hp 1993 3 cyl.) with bad compression (was 90-112-115 two years ago and now 90-92-114) to check if i can't simply deglaze and put new rings or if it's too much worn out and i need to rebore it.
It's my first attempt at this and i recently bought a relatively cheap dial bore gauge (http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=370146379884) for measuring the cylinders bore, wich are supposed to be 2.955" stock.
I want to know if i'm using the right procedure cause something seems wrong..I insert the dial indicator in the bore gauge, set it to zero, add a 2.8" anvil, then a 0.1", a 0.05" and a 0.02" spacers, wich lead to a total of 2.970" and insert the gauge in the bore, rocking it slightly to obtain the highest reading, wich came to around 0.0435 (or is it 0.087", i'm not even sure how to read it).
When i substract this from the initial lenght (2.970), it gave 2.9255, wich is smaller than the stock bore!
Is it possible that the initial fixed lenght was off a bit and that i should only use it as a rough estimate? It think of getting a good outside micrometer to put it exactly at 2.970 then zeroing there. Is this the way yo go or is there a simpliest method?
Thanks for helping a novice!
first of all, please excuse my english, as i'm french speaking.
i'm in the process of tearing down my engine (Merc 60hp 1993 3 cyl.) with bad compression (was 90-112-115 two years ago and now 90-92-114) to check if i can't simply deglaze and put new rings or if it's too much worn out and i need to rebore it.
It's my first attempt at this and i recently bought a relatively cheap dial bore gauge (http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=370146379884) for measuring the cylinders bore, wich are supposed to be 2.955" stock.
I want to know if i'm using the right procedure cause something seems wrong..I insert the dial indicator in the bore gauge, set it to zero, add a 2.8" anvil, then a 0.1", a 0.05" and a 0.02" spacers, wich lead to a total of 2.970" and insert the gauge in the bore, rocking it slightly to obtain the highest reading, wich came to around 0.0435 (or is it 0.087", i'm not even sure how to read it).
When i substract this from the initial lenght (2.970), it gave 2.9255, wich is smaller than the stock bore!
Is it possible that the initial fixed lenght was off a bit and that i should only use it as a rough estimate? It think of getting a good outside micrometer to put it exactly at 2.970 then zeroing there. Is this the way yo go or is there a simpliest method?
Thanks for helping a novice!
