cracked block test

[schmit80]

can anyone describe to me how to do a crcked block test on a 98 mercruiser 3.0 , i have water in the oil and replaced exhaust elbow, exhaust manifold and gaskets, head gasket and still have water in the oil..only thing left is head or block crack correct??

 

[achris]

Re: cracked block test

We've already done this.... You're not going to get a different result second time 'round....

http://forums.iboats.com/mercruiser...cruiser-3-0-water-oil-629487.html#post4393396

 

[thumpar]

Re: cracked block test

Why change out so many parts without diagnosing the problem first? Just pressurize the cooling side and see where the air comes from.

 

[schmit80]

Re: cracked block test

so put an air valve on the water intake and a pressure gauge on the exhaust side and pressurise

 

[84EdH]

Re: cracked block test

yes, or plug the hose going to the exhaust manifold, to isolate it from the system, and use a T on intake hose side with guage on 1 leg and pressure valve on other. ( I used a tire valve to put air in and hold )

 

[Chef Shawn]

Re: cracked block test

It's a 4 cylinder engine. Rent a compression tester, #3 or #4 cylinder will be dead. Check for rusty water trails under the carb/exhaust manifold. Sigh. Kick the tires and winterize better next time.

 

[schmit80]

Re: cracked block test

i live in hawaii i dont need to winterize, i bought a lemon

 

[achris]

Re: cracked block test

I live in Hawaii. I don't need to winterise, I bought a lemon

What are you asking for? The way I see it, you have 3 options...
1. find a good used block and swap it out.
2. Buy a new engine, swap it out.
3. Continue to use the boat as it is.

Continuing to ask the same questions here will not change the situation.

As for 'how to test the engine for a leak'.... You have already been told, twice.... In the other thread... Just follow the directions I gave you, complete with pressure gauge, various hardware fittings and compressed air....

Chris......

 

[schmit80]

Re: cracked block test

i will do it this weekend thanks..i remember seeing a rusty trail under the exhaust manifold when we took it off going to the number 4 cylinder..i just know nothing about boats...i never even drove one and decided to buy this one..he saw me coming a mile away...what are the consequences if i just keep changing the oil everytime i take it out...paid 6500 for the boat 3000 in parts and labor, i just dont feel like putting more money into it...worst experience of my life...but you live and you learn right

 

[achris]

Re: cracked block test

i will do it this weekend thanks..i remember seeing a rusty trail under the exhaust manifold when we took it off going to the number 4 cylinder..i just know nothing about boats...i never even drove one and decided to buy this one..he saw me coming a mile away...what are the consequences if i just keep changing the oil everytime i take it out...paid 6500 for the boat 3000 in parts and labor, i just dont feel like putting more money into it...worst experience of my life...but you live and you learn right

With sea water circulating in the oil passages, you will damage the engine. You could spin a bearing, or damage a cam lobe... Then you WILL be putting a complete new engine in...

And you are in Hawaii, you're in the ocean. An engine failure could be a serious problem...

Chris.....

 

[stonyloam]

Re: cracked block test

Please don't take this as criticism, but this is a perfect example of why a first time (or anytime for that matter) buyer should spend a couple hundred dollars for a survey from a reputable technician before you buy a boat. The less expensive (especially if it is free) the boat, the more it is worth it.