1996 5.7LX water in cylinders/overheated. Updated

[aldfaa]

This was the first run on a rebuilt motor. It was pulled down last august when a exhaust seat was dropped on #6 cylinder.

A rebutable machine shop mag'ed the block, and rebored. I installed a roller cam.specs are:
Summit Racing Part Number NAL-14097395

Cam Style Hydraulic roller tappet
Intake Duration at 050 inch Lift 196
Exhaust Duration at 050 inch Lift 206
Duration at 050 inch Lift 196 int./206 exh.
Advertised Intake Duration 288
Advertised Exhaust Duration 308
Advertised Duration 288 int./308 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.431 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.451 in.
Valve Lift with Factory Rocker Arm Ratio 0.431 int./0.451 exh.
Lobe Separation (degrees) 109

Also upgraded to Vortex heads with a quadrajet carb. Installed brand new mercruiser exhaust manifolds and risers.

The exhaust flappers were present and were working.

I fired the motor on Muffs to set initial timing (10 btdc), dropped her into the lake and went for a run. Everything looked good 60 PSI on oil, temp was 160-175. While it was docked I noticed there was some oil in the bilge (but I think it was from a lose oil sender. Went to loaded her on the trailer and she got to running rough.

This morning I pulled the plugs and found lots of water in all eight cylinders. I clearing the water and sprayed wd40 in the cylinders.

What do I need to do and check now?

 

[TilliamWe]

Re: 1996 5.7LX with water in all cylinders.

Re: 1996 5.7LX with water in all cylinders.

Intake manifold?

 

[aldfaa]

Re: 1996 5.7LX with water in all cylinders.

Re: 1996 5.7LX with water in all cylinders.

did a compression check
1-180
2-175
3-0
4-115
5-0
6-120
7-175
8-180

Wuth three and 5 at zero, If I had the compression testor on either cylinder and held by thumb over the other I would get compression.

Pulled the head and confirmed gasket is blown between 3-5 where it blew it also opened up around the water port.

I'll get pictures up after awhile.

I got the water cleared and the bores wiped down. bores look fine, the surface rust wiped right off.

well I am going back out to see why 4-6 is low.

 

[aldfaa]

Re: 1996 5.7LX with water in all cylinders.

Re: 1996 5.7LX with water in all cylinders.

This bank is 2-4-6-8

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this bank is 1-3-5-7 you can see where the gasket blew between 3-5

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Also on the 1-3-5-7 head there is a crack on the center web coming from the bolt holt hole

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THis is the 1-3-5-7 head

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this is the 2-4-6-8 head

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Whats the thoughts on this? could the blown gasket of caused the water in all the cylinders?

What caused the crack? I used the procedure in the manual and torqued in three steps something like 20 then 40 then 65 ibs (it was whatever the manual said as I followed it to the T.)

Three seasons ago on #6 lost a seat- motor was rebuilt and a new head installed.

Boat wasn;t ran for a year then last season it dropped #6 again.

I rebuilt with new heads and exhaust and now this. Any ideas what I am doing wrong???

Where do I need to start to make this right. I never seen above 175 for temp and oil pressure dropped to 25. Bores were cleaned and oiled. Oil was drained from crank and refilled and motor rotated.

I did have milky oil in the bilge and cannot find where it come from?

I am at a loss on how to go forward.

 

[aldfaa]

Re: 1996 5.7LX with water in all cylinders.

Re: 1996 5.7LX with water in all cylinders.

Any ideas on whats causing this? I hate to continue forward with replacing the head and installing new gaskets if its going to happen again.

 

[Bondo]

Re: 1996 5.7LX with water in all cylinders.

Re: 1996 5.7LX with water in all cylinders.

Any ideas on whats causing this? I hate to continue forward with replacing the head and installing new gaskets if its going to happen again.

Ayuh,.. 1st thought is She's Jinxed,....

Not normally a question, but what's the Hull,..??
Does the motor set Low,..??
Is there Atleast 13" from the bend of the risers, to the water level outside,..??

 

[aldfaa]

Re: 1996 5.7LX with water in all cylinders.

Re: 1996 5.7LX with water in all cylinders.

She is sitting in a 1996 Celebrity 190

 

[aldfaa]

Re: 1996 5.7LX with water in all cylinders.

Re: 1996 5.7LX with water in all cylinders.

I took the non cracked head to a machine shop, they mag'ed it and found no cracks. However with a straight edge, it was warped .011 at the center. Machinest there also pointed out the the valves had been very hot.

Is there a way to test water flow? I installed a new block water pump during the rebuild, as well as a new out drive pump and housing. I followed the service bulliten on installing perfect seal on the botom gasket.

I still need to check piston heights to see if any rods are bent. I'll also check the deck with a straight edge. I then plan on replacing the cracked head. and resurfacing the used one.

I'll also pull the lower unit and recheck water tube connecttion as well as pump condition. I'll also pull the t-stat and inspect/test. During the rebuild I installed a replacement Sierra 140 t-stat.

What else do I need to do?

 

[aldfaa]

Re: 1996 5.7LX with water in all cylinders.

Re: 1996 5.7LX with water in all cylinders.

Really need some input here.
I pulled the lower unit to check the water pump. By the way the impellar was just changed before the outing. I followed the service spec and applied perfect seal to the lower gasket.

When I pulled the lower this is what the waterpump sleeve looked like:

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Here is the impellar:

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I am guessing the exhaust melted the tube.
My questions are (1) could this of caused the overheat or is it a symptom of the overheat? (2) Why did this happen and what do I need to do to correct it?

 

[dubs283]

Re: 1996 5.7LX with water in all cylinders.

Re: 1996 5.7LX with water in all cylinders.

1. that is a result of little to no water exiting through the exhaust chamber in the drive - not a cause of overheat, but a symptom of possible overheat

2. this happened because there is either not enough supply cooling water to the engine therefore little to no water exiting, or there is a blockage in the cooling system somewhere either in-route to the t-stat housing or on the cooling water exit side of the system

my guess is seeing as how you had a head gasket failure between #3 and #5, a potential overheat is very likely - you should inspect the supply water side of the cooling system from the drive to the t-stat housing, look for kinked hose(s) and weeds/debris in the oil cooler(s)

also keep in mind, it is just as important for the cooling system to exit hot water as it is to supply cool sea water for the system - a poosible exhaust blockage may be the culprit here too

 

[aldfaa]

Re: 1996 5.7LX water in cylinders/overheated. Updated

I'll start checking the hoses. The bell housing hose was new, as was the transom hose. For that matter all hose were new.

I did have some difficulty with the routing of the transom to oil cooler hose as well as the bell housing hose. I will check those first.

I will also be installing an additional water temp guage to run for a bit to compare accuracy of stock guage.

 

[NHGuy]

Re: 1996 5.7LX water in cylinders/overheated. Updated

That bell housing to transom hose is easy to screw up. It's got to have an open, smooth, kink-free shape when the motor is running to flow the right amount of water into the boat. Once you have it set look how it sits in all running angles of the bellhousing.
A big question for your situation is if the cooling system was compromised, when did it happen? How did water get to the motor. Not through a melted lower unit feed tube.
I don't speak cam, but is that a marine grind? If it has a lot of overlap you can get reversion. If it's too aggressive of a cam then your possible solution is a different cam or a dry exhaust. Maybe you swamped the exhaust as you were loading it on the trailer? If the exhaust got too low at that point it might have been involved, take a look at the flappers, if they look cooked maybe they got that way before you did the trailer loading.
Check that the exhaust is plumbed right and that the gaskets between the exhaust manifolds and the risers are in the right way to allow your cooling water to go up into the risers. If they are off by 90 degrees it's blocked.
Crappy thing to have happen to a re-done motor, I feel for you.

 

[aldfaa]

Re: 1996 5.7LX water in cylinders/overheated. Updated

I think I may have stumbled onto a issue that may of caused this fiasco here is the parts image of the t-stat housing:

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According to the diagram, I should install the large opening gasket first, followed by the t-stat, then the plastic part. Is that correct?

When I installed the T-stat I installed it the way I found it upon engine down. It was assembled with the large opening gasket, the plastic divider, then the T-stat.

I am gussing I had it assembled incorrectly? would this of caused on overheat?

 

[aldfaa]

Re: 1996 5.7LX water in cylinders/overheated. Updated

I am thinking that the way I had it put together would of allowed water flow once the engine was up to temp. During that warm up period there was no water flowing through the exhaust which melted the supply tube. Once that tube melted, The water supply was sverly reduced, so when the t-stat did open I had reduced water flow.

Am I way off base here?

 

[Doernuth]

Re: 1996 5.7LX water in cylinders/overheated. Updated

Not sure on your tstat issue but you probably want to have the block checked out again. Heads creacked and warped usually mean problems with the block or at least damage in the bottom end.

Time to start over again. I know what its like.

 

[joncrisler]

Re: 1996 5.7LX water in cylinders/overheated. Updated

Those thermostat parts go exactly as pictured, 5,4,2, bottom to top. Sleeve, tstat, gasket.