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we have 2 suzuki 140 2 stroke motors which are loosing oil, our marine mechanic has overhauled the motor as we had a piston crack, parts were ordered from Japan the sleeves was rebored new pistons where placed inthe motor as well as new rings.

We have been to sea on 3 occassions the first very little oil was used, the second time a little more was used and the third trip we lost a lot of oil, the mechanic cannot seem to find where the oil is comming from

Please can you help

Submitted: 157 days and 12 hours ago.

Category: Boat

Value: $31

Status: AWAITING EXPERT REPLY

2001 Suzuki 140 4 strokes

Already Tried:
The engines started loosing oil. The engine was opened and 2 pistons were cracked. They replaced 2 valve guides, rebored the sleeves and new pistons, new rings and new bearings were placed in our motor. The resoroir was checked for cracks of which none was found. We have developed the same problem where the oil is stillescaping through the exhaust.

Posted by Boat Man 157 days and 12 hours ago.

Info Request

Hello,
You say you have 2 stroke motor, but are loosing oil. I am confused if you are meaning you are loosing the 2 stroke oil from the resevoir or if (more likely) you have 4 strokes and are consuming oil.
Can you please clarify the question a little?
Thanks

157 days and 12 hours ago.

Reply

sorry the motors are 4 stroke and not 2 stroke as i indicated

Posted by Boat Man 157 days and 11 hours ago.

Info Request

Hello again,
Makes more sense.
Are they both motors loosing the same amounts or you only having a problem with one?
What type of hours do they have before and after repairs?

157 days and 11 hours ago.

Reply

only the one motor. The motors have quite a lot of hours on them but after the repairs it only did 2 hours and we realised the same problem as before the repairs.

Answer

Ok, it sounds like either you have not cured the original problem or the rings are cracked from the new work allowing the oil to get past them and get burned up and shot out exhaust.
If you are seeing oil at the exhaust it means it is getting there from the valve seats, a head gasket leak, or past the rings. It could also be possible the head is warped and caused gasket to fail after short period of time getting worse with time.
The mechanic should perform a cylinder leakdown test to verify where the leak is. He should have a leakdown test manifold and gauges. Most likely the head will need to come back off to be checked thoroughly for issues.

Accepts:
Expert:	Boat Man
Pos. Feedback:	100.0 %
Answered:	6/18/2009

Marine Mechanic

30+ years experience in boats related industries

157 days and 7 hours ago.

Reply

I HAVE JUST INFORMED OUR MECHANIC TO TAKE THE HEAD OFF AND HAVE IT CHECKED. WILL NOTIFY YOU SHORTLY.

THANKS

ROLENE

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Info Request

Hello,You say you have 2 stroke motor, but are loosing oil. I am confused if you are meaning you are loosing the 2 stroke oil from the resevoir or if (more likely) you have 4 strokes and are consuming oil.Can you please clarify the question a little?Thanks

Reply

sorry the motors are 4 stroke and not 2 stroke as i indicated

Info Request

Hello again,Makes more sense.Are they both motors loosing the same amounts or you only having a problem with one?What type of hours do they have before and after repairs?

Reply

only the one motor. The motors have quite a lot of hours on them but after the repairs it only did 2 hours and we realised the same problem as before the repairs.

Answer

Reply

I HAVE JUST INFORMED OUR MECHANIC TO TAKE THE HEAD OFF AND HAVE IT CHECKED. WILL NOTIFY YOU SHORTLY. THANKS ROLENE

Related Boat Questions

Hello,
You say you have 2 stroke motor, but are loosing oil. I am confused if you are meaning you are loosing the 2 stroke oil from the resevoir or if (more likely) you have 4 strokes and are consuming oil.
Can you please clarify the question a little?
Thanks

Hello again,
Makes more sense.
Are they both motors loosing the same amounts or you only having a problem with one?
What type of hours do they have before and after repairs?

I HAVE JUST INFORMED OUR MECHANIC TO TAKE THE HEAD OFF AND HAVE IT CHECKED. WILL NOTIFY YOU SHORTLY.

THANKS

ROLENE