5.7L bravo 1 Water in cylinders 1 and 3 after overheat need advice

[thumpar]

From what I understand it needs to be in open air so maybe up closer to the kicker. That would make it easier to get to also.

 

[mr300z87]

I fully understand the concept of the electric pump just trying to keep things simple. I was out working on the Sea Ray today no engine run but exhaust is on maybe tomorrow will be the big day. I am getting nervous. . As for this project I think I am going to bail on the engine I referred to ^^^ I just don't have the time to drive 2 hours for it, I keep looking and find something local. I need to stay focused on the big boat for 2017. Have a great night all. BTW I try and do a good job taking care of my stuff, things happen!!

 

[bruceb58]

It can't be in an enclosed space with an engine. The bulbs aren''t fire proof. Same reason you need to use marine fuel line in the same area. It can resist flame for a certain amount of time. There are no bulbs that are fire resistant.

 

[mr300z87]

success!!!!! The 7.4L fires up with the key, I am very happy, if all goes well might sea trial in a few weeks. I will update my other thread also.

https://youtu.be/dLpjzwxgOjI

The only thing that sounds better than a BB Chevy is a BB Mopar

https://youtu.be/JuE6n5MBZJ4

 

[mr300z87]

Even though I was not really looking for an engine, I found one the was the right price and some what convenient so it is now sitting in my garage on a dolly. Its from a 92 Chevy truck. The plan is to pull all the truck hardware off and evaluate what I got. Compression test and possibly even a run test with a squirt of fuel into the throttle body, if I can figure out how to activate the truck ignition. Even if it does not check out good it has never had salt water in it like my boat engine so it could be my first engine rebuild project. The Sea Ray is still my priority, though this weekend is not looking to good as we could see some of the Hurricane here in NJ. Hope to start working on the transom of the Sea Ray though.

In the future I am going to have questions with getting this engine converted for Marine use and will probably open a new thread when the time comes.

For those in Hurricane Hermine's path be safe.

 

[mr300z87]

I think I am allowed to revive this thread since I started it. Since my last post 3.5 years ago the Sea Ray has been on the water and we love having her.

At this point I am working with a friend to revive the Invader, he bought a reman 5.7L and it is near ready for a test fire and break in on the dolly before going into the boat. My question is regarding the new OE exhaust he purchased, I noticed the mating surface of the elbow (haven't opened the manifold box yet but assume it the same) is coated with the same black coating as the rest of the part, should this be removed prior to assembly?

I am sure this question has been asked before but I could not find a definitive answer. Of course I will be using all MerCruiser parts. As always any advice is greatly appreciated. Stay Safe
Mike

PS: Best news we got this week was that NJ marinas were allowed to open.

 

[Scott Danforth]

I think I am allowed to revive this thread since I started it. Since my last post 3.5 years ago the Sea Ray has been on the water and we love having her.

At this point I am working with a friend to revive the Invader, he bought a reman 5.7L and it is near ready for a test fire and break in on the dolly before going into the boat. My question is regarding the new OE exhaust he purchased, I noticed the mating surface of the elbow (haven't opened the manifold box yet but assume it the same) is coated with the same black coating as the rest of the part, should this be removed prior to assembly?

I am sure this question has been asked before but I could not find a definitive answer. Of course I will be using all MerCruiser parts. As always any advice is greatly appreciated. Stay Safe
Mike

PS: Best news we got this week was that NJ marinas were allowed to open.

if you want to remove the paint do so, however not required

use only Mercruiser gaskets........enjoy boating

 

[Lou C]

I had a similar problem the same time actually. My ‘88 4.3 had a bad overheat in 7/2013 and it seemed fine after that (replaced flappers, exhaust hoses and water tube grommets in the drive; normal comp test results and ran fine for 2 more seasons). Then in 8/16 it became reluctant to start and would run rough at first then would mostly smooth out. Come to find out I had water in one cyl and just a spray of water in another (#2 and #1). It never did hydrolock though.
Did some tests; took it apart and found 2 blown Head Gaskets. Took heads to machine shop and tgey recommended replacement based on cracks in center cyls exhaust seats and erosion of cooling passages. I installed reman heads and upgraded it to center riser style exhaust from the old bat wings (which never leaked). Still running well 3 years later but it was a risk that the short block was still ok.

 

[Lou C]

PS to answer the OPs question about removing paint on manifolds and elbows due to concerns about the uneven paint thickness on the mating surfaces I thought it better to remove the paint. So that’s what I did.

 

[Lou C]

PPS:
I’m not so sure I’d go Vortec, because:
there have been a lot of issues with the intake gaskets on both the V8 and V6, it’s important to use the best gaskets you can find like Fel Pro...
and...I think GM made a mistake reducing the # of bolts from 12 to 8 and the torque from 30 to 10 ft lbs. that’s awfully low!
yep it would be nice to get 20 more hp, but not water in the oil!
on the old pre Vortec intake gasket problems were not at all common. In fact they were hard as hell to get off my old intake! Baked on like Kryptonite!

 

[mr300z87]

Thanks for the responses. I will check the surfaces for flatness with a straight edge and decide then to remove or leave. FYI the hard parts as well as the gaskets are all MerCruiser. Learned the hard way on my Sea Ray engine when a non OE exhaust gasket failed and it sounded like it was internal valve tap.

 

[Lou C]

I used Barr Marine aftermarket parts and gaskets, for OMCs getting OE parts is difficult or impossible and the other option was Volvo Penta OE at close to 2x the price. That and the knowledge that Barr actually casts parts for the OEMs made it an easy decision. Installed in 2017, so far so good.