Replacement engine from Rapidomarine...

[cpt ron jc]

Re: Replacement engine from Rapidomarine...

kevo why did y install rockers from your engine to reman i dont understand,i ordered mine from rapido,rahaul said it will be ready in week or so ,i will pull engine and strip parts soon,have to have it done by nov the cold weather wiil soon be here,do y think engine will be ok if i install in spring april or may 1,im not sure i want to do the whole job now,i have a shed i could keep motor dry,no problem,i bought now i think price will go up aft jan.

 

[mnypitboat]

Re: Replacement engine from Rapidomarine...

kevo why did y install rockers from your engine to reman i dont understand,i ordered mine from rapido,rahaul said it will be ready in week or so ,i will pull engine and strip parts soon,have to have it done by nov the cold weather wiil soon be here,do y think engine will be ok if i install in spring april or may 1,im not sure i want to do the whole job now,i have a shed i could keep motor dry,no problem,i bought now i think price will go up aft jan.

He had roller rockers on the old engine. The new engine likely came with stamped rockers.

 

[cpt ron jc]

Re: Replacement engine from Rapidomarine...

whats the difference roller or stamped rockers,whats the advantage to switching over.

 

[Kevoz]

Re: Replacement engine from Rapidomarine...

Yes, the new reman engine came with stamped rockers, the roller rockers from the dead engine are aftermarket parts that offer less resistance and less wear, and/or better performance(minimal, but are better nonetheless).
If it were me, I would get it in as fast as possible since there are a myriad of problems that can occur by waiting....just my 2 cents.
LilMissMoneyPit is ready for a splash on Friday, supposed to be in the 80's then...Gotta take care of a few things on punch list before then, taking the lift and eng stand back home this afternoon, the swap went very well and I am very pleased with the engine that Rapidomarine sent...
Hope for the best, expect the worst...
cheers,
Kevo

 

[45Auto]

Re: Replacement engine from Rapidomarine...

Just got home from finishing up a Rapido 5.7L long block in my Sea Ray this evening after work. Purrs like a kitten on muffs. Hope to get it into the water this weekend.

 

[Countyboater]

Re: Replacement engine from Rapidomarine...

I'm also looking to purchase two 5.7 for my searay in a couple of weeks, I have been checking leaning towards Rapido,so many to choose from.

 

[Raystownboater]

Re: Replacement engine from Rapidomarine...

Just got home from finishing up a Rapido 5.7L long block in my Sea Ray this evening after work. Purrs like a kitten on muffs. Hope to get it into the water this weekend.

Im pulling out my old 228 and dropping in the 5.0 long block from Rapido this weekend. Im planning on two days for the swap......is this realistic? I've never done a marine engine before but I have everything disconnected on the old one and all we need to do is hook up the chains and take care of the motor mounts. My only real concern is getting the alignment correct

 

[Bondo]

Re: Replacement engine from Rapidomarine...

Im planning on two days for the swap......is this realistic?

Ayuh,.... Are you a Well equiped Mechanic,..?? ya, it's Doable....

My only real concern is getting the alignment correct

You absolutely Must have the alignment bar....

 

[Raystownboater]

Re: Replacement engine from Rapidomarine...

Ayuh,.... Are you a Well equiped Mechanic,..?? ya, it's Doable....

You absolutely Must have the alignment bar....

I have the use of a well equipped shop and also have the alignment bar.

 

[Raystownboater]

Re: Replacement engine from Rapidomarine...

I have the use of a well equipped shop and also have the alignment bar.

Ive been googling the use of the alignment tool and have found several sites that say the bar is not needed if the front engine mounts are removed from the block instead of the stringers. Also, there are those who say the best way to align the engine is to use the drive itself. Any thoughts?

 

[coheej]

Re: Replacement engine from Rapidomarine...

The hull of the boat probably changes slightly over the years, so I think the alignment should be checked. Also, you're not installing the same block and I'm sure the machining is not always identical.

I used both the alignment tool and the drive when I installed mine. I thought the alignment tool was harder to get a slip fit with than with the drive. The dimensions of the tool are probably tighter than the drive fit.

 

[45Auto]

Re: Replacement engine from Rapidomarine...

Ive been googling the use of the alignment tool and have found several sites that say the bar is not needed if the front engine mounts are removed from the block instead of the stringers. Also, there are those who say the best way to align the engine is to use the drive itself. Any thoughts?

Sounds like typical good internet advice. If you like pulling engines and replacing couplers, it'll work fine.

It would be interesting to see how they use the drive to align the engine. Seems like it would be a major pain. Do you have a link?

 

[coheej]

Re: Replacement engine from Rapidomarine...

It would be interesting to see how they use the drive to align the engine. Seems like it would be a major pain. Do you have a link?

In my case, I had taken the u-joints apart to look at their condition. When I was doing my alignment, it was still apart so I just checked it with both the alignment tool and the splined input shaft. The input shaft was easier to slip in than the alignment tool. So I think the alignment tool is more accurate, but I think you could use the input shaft also.

 

[mnypitboat]

Re: Replacement engine from Rapidomarine...

The blocks are not machined the same, so definately align it. If you rebuilt your old engine, you might be ok, but since the block is new,,,,,,,,, actually, just align it.

 

[Kevoz]

Re: Replacement engine from Rapidomarine...

Here is the latest update on my boating project with the new long block...Took her out Friday a.m., had shift cable issues, engine power issues, oil leak rear of intake, choke issues...shift cable issue taken care of, fixed choke linkage, tried to fix oil leak, didnt, thought choke issue might have been my power issue, nope...still having low power issue, (ignition spot on @ 8deg btdc)
RapidoMarine on holiday I suppose, will talk with him tomorrow...

Things I plan to do, remove risers, ex manifolds, remove plugs, remove intake/carb, etc.,check compression, (I think the valve lash may be too tight), check valve lash, adjust valves, retest compression,
(fuel delivery all the same as previous engine which ran like a top with the exception of oily froth blowing out all kinds of holes in block)
...reinstall intake, make oil stop leaking!
If low on compression after all this, I think I will just shoot meeself! I am soo tired of working on dis boat! I will probably have it in my backyard now all friggin winter! (It belongs in Indianapolis!) Any thought or suggestions greatly appreciated and, no, I already mentioned arson to the wife, she likes the idea but has a conscience as do I, lol...

Dear Boating Gods, please give me the strength I sorely need to get through these last few hard times to make this hulk seaworthy! Amen!
cheers,
Kevo <@wits end!

p.s. If you have any thought that might jar loose the culprit of my problem, by all means, make me look like a simpleton and state it here sooner than later....I will be back in to check this after I have all that heavy crap (risers, manifolds, etc) laying on the new carpet in the boat, lol...

 

[John_S]

Re: Replacement engine from Rapidomarine...

You might want to give some more details on your engine. A quick look back in this thread did not reveal it to me. I didn't even catch the engine size.

Checking the compression would be good, but don't know why you are taking apart the exhaust???

Did you use the rubber or cork gaskets for the front and back of the intake? If so, toss them and just use the rtv recommended.

Please provide some details on the lack of power. I would think you are still breaking it in, and wouldn't have gone to full throttle yet.

 

[Kevoz]

Re: Replacement engine from Rapidomarine...

Sorry, it is a 4.3L Mercruiser w/1pc rear main seal, 86-87 model year, pre-Vortec just recieved two weeks ago from www.Rapidomarine.com

I removed the exhausts to get to the plugs and aid in removing the valve covers for possible adjustments. I just finished the compression tests, prior to looking at the valves and got at least 210lbs/sq/inch on them all which is a pleasant surprise which leads me to believe that the valves might be loose, I don't know how that would have happened, but I know anything can happen to anyone anytime....
The engine would not turn past lets say 3000rpm going over a water fall...and there was a staunch smell of gasoline around the engine, I had the dog house off the engine until I get things right, there was no smell of gas with the old engine at all with no visible signs of a fuel leak anywhere. I am happy at the moment with the compression tests and the fact that it has good oil pressure and doesn't knock which relieves the thought of pulling it, lol...So, i.e. installer error I am sure, just have to track it down. And, as I had stated, the ignition was spot on @ idle @ 8deg BTDC and I did not change the carburetor at all, just removed/installed. I also know the electronic advance is at least working as it would advance when the rpm's would go past idle when getting the ignition right. I also made a mental note of the cam timing prior to capping up the front end with the cover, making sure the marks were correct.
cheers,
Kevo

p.s. the rtv was used as sealer for the front and back of the intake manifold, I have already tried to scrape it off the rear and reapply to no avail, I am removing the intake to solve this problem, it just has to be done...
Even with full throttle, it wont budge past this rpm, I know it shouldnt have been tried, but, there is a problem, holding it back is one thing, not going there is another..

 

[John_S]

Re: Replacement engine from Rapidomarine...

The engine would not turn past lets say 3000rpm going over a water fall...and there was a staunch smell of gasoline around the engine, I had the dog house off the engine until I get things right, there was no smell of gas with the old engine at all with no visible signs of a fuel leak anywhere...

1st order of business is finding the gas leak. If no external leaks, it could be leaking into oil from a mechanical fuel pump, discharged down the carb from the fuel pump overflow, or stuck open needle/seat in carb. Check the oil for overfill and gas oder. With any luck, this is just a bad fuel pump, and is causing your power issue as well.

 

[Kevoz]

Re: Replacement engine from Rapidomarine...

I have an electric fuel pump, no mechanical machining in block, so, no holes. I will check the oil and the floats/needles/seats tomorrow...Getting dark and I am spent.
thanks for the reply,
cheers,
Kevo

 

[Kevoz]

Re: Replacement engine from Rapidomarine...

Rear oil leak was id'd with application of foot powder to oil leak area, I had relied solely on the new gasket @ the base of the distrubutor to catch oil there, it does not, pulled and appllied RTV, reinstalled to new marks. Got it all capped back up, all that is left is cracking the carb open. The oil had no gas smell and the intake was wet inside when I took the carb off, so, I suspect the float/needle as suggested prior post. I think I am making headway....
cheers,
Kevo