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No compression. We put new pistons and now having trouble to…

Customer Question
No compression Mechanic's Assistant:...

No compression

Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so the Marine Mechanic can help you best.

We put new pistons and now having trouble to get compresión

Submitted: 3 months ago.Category: Boat
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Customer reply replied 3 months ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call.
Customer reply replied 3 months ago
Let me know if you need more information, or send me the service offer(s) so we can proceed.
Answered in 13 minutes by:
11/7/2017
Marine Mechanic: Shane Creekmore, Marine Mechanic replied 3 months ago
Shane Creekmore
Shane Creekmore, Marine Mechanic
Category: Boat
Satisfied Customers: 302
Experience: I have over 20 years experience in the marine industry as a mechanic and powerhead tech at a major re-manufacturing company
Verified
What year and horsepower engine do you have?
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Customer reply replied 3 months ago
2006 Mercury 225 hp
Marine Mechanic: Shane Creekmore, Marine Mechanic replied 3 months ago
Optimax? Did you use new rings? Was the block bored oversized?
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Customer reply replied 3 months ago
Is 4 stroke
Customer reply replied 3 months ago
Salt water engine
Marine Mechanic: Shane Creekmore, Marine Mechanic replied 3 months ago
Do you have zero compression on all cylinders or just one?
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Customer reply replied 3 months ago
Some zero compression some 45 compression and some 50 compression
Marine Mechanic: Shane Creekmore, Marine Mechanic replied 3 months ago
Was the block bored or just honed?
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Customer reply replied 3 months ago
What that means ?
Marine Mechanic: Shane Creekmore, Marine Mechanic replied 3 months ago
Did you take the block to a machine shop or did you just swap Pistons?
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Customer reply replied 3 months ago
We did took the block to a machine shop
Marine Mechanic: Shane Creekmore, Marine Mechanic replied 3 months ago
You should call the machine shop and ask them if they bored your block oversized or if they left it standard bore. The most probable answer is the bored the block oversized and you have standard Pistons. you have to match the bore to the Pistons for it to build compression. About the only other things that can cause the compression to be that low is if you reused your old head gasket and it is leaking or if the exhaust valves or not seating
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Customer reply replied 3 months ago
We reuse same pistons only new rings but also having trouble setting up the timing could you help me with the rite set up on the timing
Marine Mechanic: Shane Creekmore, Marine Mechanic replied 3 months ago
I dont think I have my 4 stroke manuals here at home but I will check. Call the machine shop before you go through the trouble of timing it and see if any of the cylinders were bored. Can you send the model number so I can go check my shop manuals?
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Customer reply replied 3 months ago
This is the only thing I find
Mercury f225
P.N###-##-####A1
SPN # 005096
Marine Mechanic: Shane Creekmore, Marine Mechanic replied 3 months ago
Thanks. I'll check. Is the machine shop still open?
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Customer reply replied 3 months ago
No why?
Marine Mechanic: Shane Creekmore, Marine Mechanic replied 3 months ago
To see if they bored the block. The only other way to know is to pull the heads and measure the bore
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Marine Mechanic: Shane Creekmore, Marine Mechanic replied 3 months ago
What questions do you have on timing your motor? I don't have my shop manual here at home but I may be able to walk you through on some things
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Customer reply replied 3 months ago
if they did Bore the block tha meansneeds new pistons
Customer reply replied 3 months ago
I need the rite set up for timing
Customer reply replied 3 months ago
Hello
Customer reply replied 3 months ago
You still there
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Shane Creekmore
Shane Creekmore
Shane Creekmore, Marine Mechanic
Category: Boat
Satisfied Customers: 302
302 Satisfied Customers
Experience: I have over 20 years experience in the marine industry as a mechanic and powerhead tech at a major re-manufacturing company

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