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I have a mercruiser 4.3 LX, 6 cilynders, carburated with 350 hours. The engine was running perfect and then when I stopped the boat in my slip place I started to listen and I heard a "clicking" noise, something mechanical, rhythm and I can feel that is close to the heads. Normal oil pressure, normal temperature, normal oil level without water. Any ideas ??? I'm afraid to use this boat with this "crackling" noise and turn a small problem into a BIG ONE. THANKS

Submitted: 251 days and 14 hours ago.

Category: Boat

Value: $9

Status: AWAITING CUSTOMER ACTION

Welcome to JA

either you need to adjust your valves or you have an exhaust leak at the exhaust manifold

Accepts:
Expert:	ROCKET
Pos. Feedback:	98.0 %
Answered:	3/16/2009

Marine Mechanic

I HAVE BEEN WORKING ON BOATS OVER 25 YEARS

251 days and 14 hours ago.

Reply

Thanks

Can I do some test to be sure if it is only valves adjust or an exhaust leak ??? Do I need to replace the exhaust manifold or only the gaskets ??? Could you please give me more advices ??? I have the MERCRUISER REPAIR MANUAL and I am not afraid to use some tools in fact I really like to work in my boat. I just rebuilt my carburetors the boat was running GREAT and maybe I gave to much FULL THROTTLE. HELP ME PLEASE !!!! I can't afford to spend to much money right now in this boat ...

Posted by ROCKET 251 days and 14 hours ago.

Answer

for the exhaust leak, start the boat up and feel around them for warm air coming out

as for the lifter, it could be a stuck lifter, i have seen that more than once

251 days and 13 hours ago.

Reply

thanks again for your prompt reply...
do you think the best way to solve this problem is to replace the exhaust manifolds and open the cylinders head and adjust the valves???
Do I need special tools for it ???
tks

Posted by ROCKET 251 days and 13 hours ago.

Answer

you will need a torque wrench
do he exhaust manifold check first
then come back on here to this question

all you need to do is pull the valve covers
read over the manual

250 days and 23 hours ago.

Reply

Hi ... I'm back here

I started the engine this morning without probelms. Just turned key and the engines was running. The "clicking noise" is there... I can't feel any HOT AIR coming from the Exhaust Manifold...
Should be the lifter ??? How could I be sure which one ???
Do I need to replace all of them ???

Tks

Paulo

Posted by ROCKET 250 days and 22 hours ago.

Answer

you need to pull that side of valve cover and watch and listen to the lifter and pushrods

Posted by ROCKET 250 days and 21 hours ago.

Answer

run for 10 minutes. if the lifter has collapsed that rocker will be loose

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Accepted Answer

Welcome to JAeither you need to adjust your valves or you have an exhaust leak at the exhaust manifold

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Answer

for the exhaust leak, start the boat up and feel around them for warm air coming outas for the lifter, it could be a stuck lifter, i have seen that more than once

Reply

thanks again for your prompt reply... do you think the best way to solve this problem is to replace the exhaust manifolds and open the cylinders head and adjust the valves???Do I need special tools for it ???tks

Answer

you will need a torque wrenchdo he exhaust manifold check firstthen come back on here to this questionall you need to do is pull the valve coversread over the manual

Reply

Answer

you need to pull that side of valve cover and watch and listen to the lifter and pushrods

Answer

run for 10 minutes. if the lifter has collapsed that rocker will be loose

Related Boat Questions

Welcome to JA

either you need to adjust your valves or you have an exhaust leak at the exhaust manifold

for the exhaust leak, start the boat up and feel around them for warm air coming out

as for the lifter, it could be a stuck lifter, i have seen that more than once

thanks again for your prompt reply...
do you think the best way to solve this problem is to replace the exhaust manifolds and open the cylinders head and adjust the valves???
Do I need special tools for it ???
tks

you will need a torque wrench
do he exhaust manifold check first
then come back on here to this question

all you need to do is pull the valve covers
read over the manual