Water in cylinder, oil and carburetor

[wearzy]

3.0l 1988 mercrusier 3.0l

Engine ran fine before winterized, went to start and realized water in cylinder 3 and 4. Did compression test after getting water out.
#1 cylinder-150
#2 cylinder-155
#3 cylinder-115
#4 cylinder-115
Starting thinking head gasket. So started to taking it apart. As well as manifold.


1) Is there supposed to be rust by carburetor? There was water in the top of the manifold by carburetor and carb was filled with water.

2) head gasket was metal, I believe gasket was issue because of rust marks. Can you please confirm?

3)manifold gasket was bad as seen in picture, will replace. Can it be cleaned up?

4) The riser gasket was bad, could that cause the water in carb?

Thanks for all your help and input is greatly appreciated!

 

[Scott06]

3.0l 1988 mercrusier 3.0l

Engine ran fine before winterized, went to start and realized water in cylinder 3 and 4. Did compression test after getting water out.
#1 cylinder-150
#2 cylinder-155
#3 cylinder-115
#4 cylinder-115
Starting thinking head gasket. So started to taking it apart. As well as manifold.


1) Is there supposed to be rust by carburetor? There was water in the top of the manifold by carburetor and carb was filled with water.

2) head gasket was metal, I believe gasket was issue because of rust marks. Can you please confirm?

3)manifold gasket was bad as seen in picture, will replace. Can it be cleaned up?

4) The riser gasket was bad, could that cause the water in carb?

Thanks for all your help and input is greatly appreciated!

Looks like you got water in the carb and down in the manifold. Was flame arrestor cover on it? This is one of the reasons the cover is for.

do the valves close fully on those cylinders or have rust on them. May want to take head apart and consider valve job. In hindsight Would have been good to pressure test the cooling system and do a leakdown test prior to tear down To confirm head gasket leak and source of lower compression in two cylinders

 

[Bt Doctur]

1) Is there supposed to be rust by carburetor? There was water in the top of the manifold by carburetor and carb was filled with water.

drain plug left in and sunk on land? tarp failure ?

 

[wearzy]

Looks like you got water in the carb and down in the manifold. Was flame arrestor cover on it? This is one of the reasons the cover is for.

do the valves close fully on those cylinders or have rust on them. May want to take head apart and consider valve job. In hindsight Would have been good to pressure test the cooling system and do a leakdown test prior to tear down To confirm head gasket leak and source of lower compression in two cylinders

 

[wearzy]

Flame arrestor was on. I’ve posted some pics of valves and head. Let me know what you think, I’m going to take to machine shop.

 

[wearzy]

Flame arrestor was on. I’ve posted some pics of valves and head. Let me know what you think, I’m going to take to machine shop

1) Is there supposed to be rust by carburetor? There was water in the top of the manifold by carburetor and carb was filled with water.

drain plug left in and sunk on land? tarp failure ?

drain plug was removed and we have engine cover over it. Good ideas thank you!

 

[Scott06]

Flame arrestor was on. I’ve posted some pics of valves and head. Let me know what you think, I’m going to take to machine shop.

Not the flame arrestor, the flame arrestor cover. It is a plastic cover that goes on top of FA that is bigger than it keeps water from dripping on it. On the V6/V8 engines it also covers the distributor, which on my boat is right under the seam between the hull and the sunpad so gets wet when we hang out and swim.

There is enough rust in the combustion chambers and valves that I would either pop the valves out and maybe do a quick lapping and clean up the stems, or better yet if you have a local machine shop that can look at it and make do a valve job in a reasonable amount of time. Also need to check the head and block mating surfaces for flatness.

from the info presented I would think you got water or condensation under the cover and into your engine. do the bores look ok?

 

[Bondo]

Not the flame arrestor, the flame arrestor cover. It is a plastic cover that goes on top of FA that is bigger than it keeps water from dripping on it. On the V6/V8 engines it also covers the distributor, which on my boat is right under the seam between the hull and the sunpad so gets wet when we hang out and swim.

There is enough rust in the combustion chambers and valves that I would either pop the valves out and maybe do a quick lapping and clean up the stems, or better yet if you have a local machine shop that can look at it and make do a valve job in a reasonable amount of time. Also need to check the head and block mating surfaces for flatness.

from the info presented I would think you got water or condensation under the cover and into your engine. do the bores look ok?

Ayuh,... I understand what yer saying, but even with the f/a, 'n the cover, I've seen water run right down the carb center stud, 'n still cause problems,.....

 

[Scott06]

Ayuh,... I understand what yer saying, but even with the f/a, 'n the cover, I've seen water run right down the carb center stud, 'n still cause problems,.....

gotcha. never seen that but makes sense not like the stud is water tight.

Other thing is condensation under the covers, the one year I had to leave my boat outside I out a plastic trap over the snap on cover , holy chit in the spring ...

 

[cyclops222]

Who winterized the engine ? Was it stored outside ? Did the cover blow away ? So very sad.

 

[wearzy]

Not the flame arrestor, the flame arrestor cover. It is a plastic cover that goes on top of FA that is bigger than it keeps water from dripping on it. On the V6/V8 engines it also covers the distributor, which on my boat is right under the seam between the hull and the sunpad so gets wet when we hang out and swim.

There is enough rust in the combustion chambers and valves that I would either pop the valves out and maybe do a quick lapping and clean up the stems, or better yet if you have a local machine shop that can look at it and make do a valve job in a reasonable amount of time. Also need to check the head and block mating surfaces for flatness.

from the info presented I would think you got water or condensation under the cover and into your engine. do the bores look ok?

 

[wearzy]

would the bad manifold gasket cause water to get in cylinder ?

 

[wearzy]

would the bad manifold gasket cause water to get in cylinder ?

Ayuh,... I understand what yer saying, but even with the f/a, 'n the cover, I've seen water run right down the carb center stud, 'n still cause problems,.....

would a bad head gasket cause the water into cylinders and manifold?

 

[Scott06]

would the bad manifold gasket cause water to get in cylinder ?

would a bad head gasket cause the water into cylinders and manifold?

A bad head gasket or leak between manifold and elbow/riser could cause water in a cylinder, as could a cracked head.

But I doubt at 115 psi you had a leaking head gasket and its obvious the manifold was full of water by the carb. So doubt there was any issue with the head gasket or elbow to manifold gasket from the looks of things.

 

[wearzy]

Thanks for your help, I tested the manifold and no cracks. Taking the head to machine shop to see if they can see something I can’t.