rebuilt bridgeport white smoke from exhaust black water from mid

[Dave Strong]

basically the shop said leakdown don't work on new rings

Dave

[Slimm]

I can't say for that shop or anyone else, but when I rebuilt my 2.5 Mercury the cranking compression as well as leakdown numbers improved significantly after every trip out up to the 8-10 hour mark.


Slimm

[Dave Strong]

When I rebuilt my Bridgeport when I retorqued the heads at 2hrs rings were seated. The only way it would take more time to seat is if TiN rings were used. Still after a couple hours leakdown should be under 10% , sounds like they want the warranty to be gone before they do anything.

Dave

[dompie99]

I partly disagree on this. Yes you cannot run a leakdown test on a brand new engine and NO it would not show 20% or 15%.
as for white smoke, water is the issue....mine was ''J.B. Welded'' between the water jacket and cyl No 6.....been welded but still leaking so the '' genius '' used J.B. weld but it did not helped.

After about 5 to 7 hours, you could get a pretty decent leakdown figure ( IMO ).

From the figures you said, one side was ',tight '' and the other side is quite '' LOOSE '' pulll the heads and ''investigate ''

[dompie99]

basically the shop said leakdown don't work on new rings

If they can't do a leakdown test on New rings, how come the 2,4,and 6 are at around 5 to 7% ??

the engine seated unevenly ??!!!! OMG.....yeah right

[Dave Strong]

I partly disagree on this. Yes you cannot run a leakdown test on a brand new engine and NO it would not show 20% or 15%.
as for white smoke, water is the issue....mine was ''J.B. Welded'' between the water jacket and cyl No 6.....been welded but still leaking so the '' genius '' used J.B. weld but it did not helped.

After about 5 to 7 hours, you could get a pretty decent leakdown figure ( IMO ).

From the figures you said, one side was ',tight '' and the other side is quite '' LOOSE '' pulll the heads and ''investigate ''

So the average Nic motor lasts 100- 130hrs before rering. You can't check to see if the rings have seated till it 5-10% worn, I call
Funny how the F1 and Drag boys back there boat down the ramp and spend 10min running in a new motor, then take it out and turn 10k with it. No 5-10hr break in.

Dave

[Slimm]

So the average Nic motor lasts 100- 130hrs before rering. You can't check to see if the rings have seated till it 5-10% worn, I call
Funny how the F1 and Drag boys back there boat down the ramp and spend 10min running in a new motor, then take it out and turn 10k with it. No 5-10hr break in.

Dave

While I see your point, I do think there is a difference between the components used in an F1 or Drag engine and those used in general purpose 'fishing' type applications where they need to stay together for more than a hundred or so hours. As I said when I made my comment, the numbers on my engine continually got better the more I ran it, up to around 8-10 or so. I am fairly new to outboards but have built hundreds of car/truck engines while working as a machinist. My opinion is there are many factors that come into play when 'breaking in' an engine; finished bore size (tight/loose), piston material, bore finish, and ring material. You can call BS all you want, you have that right, but I know how to do a compression test as well as a leakdown and my numbers went up the more I ran he engine. I don't have a nice fancy boat or an expensive high performance/race engine, I just have a 2.5 200 offshore block with factory Mercury pistons and rings with a few addons (CCM reeds, spacer, bucket full of epoxy stuffed here and there). There may be a difference in the better stuff, but my results are what I had to offer.


Slimm

[dompie99]

I agree with the preceding post as much as I could. And you know, what amaze me a lot is, some one comes over here for suggestions, tips, informations on HOW to gain this or that and what would be the best way to gain them ( HP's, RPM's etc etc ) and they have the .. nerves '' to write down '' '', i am stunned...really.

I also ran highly modified small block chevy in another life and, also, finished the engine on friday night 23h00 and was on the track on saturday with barely 30 MINUTES of breaking-in and YES I had good numbers way back than. This beeing said, I do not hold the holly grail neither I hold the total truth on this board but one thing i know for sure, If the Theory don't match the practice, re-write the theory ( Engineering University training hard learned lessons )


No offence but there is a whole lots more BOAT site on this Web, I invite to to solicitate the info's on another site If you may .

[Dave Strong]

I thought this thread was about a Bridgeport not a fishing motor.

Dave

[eli]

Me too ,you can have good compression numbers and have bad leakdown numbers , I have seen it many times
case in point local seller has a 88 merc 200 for 1600$ I called and asked if I could do leak down he said fine but its not necessary
he said I used to work for evinrude I know how to do a compression test and is very accurate ,while compression showed 110/105 across
which is low for merc 200 , here is my results
cyl 1 --20%
cyl 3--17%
cyl 5--12%
cyl 2--7%
cyl 4--5%
cyl 6--7%
and he was going to sell engine to a buyer ,said it needs sea foam to decarbon it
then it would be fine lmfao

[flabum1017]

update ,replaced ecu switch boxes , ,spark plug wires were wrong ones ,and fixed power head stud
said motor not broke in yet so cant look at leakdown numbers B.S. I say ,
so owner is running motor says it runs ok

if the customer is happy, your'e happy and this time next year or sooner, he will be looking to rebuild it again.......

[eli]

shop removed head gaskets when they changed other stuff said all looked normal we will see given time when normal shows up .

[Dave Strong]

shop removed head gaskets when they changed other stuff said all looked normal we will see given time when normal shows up .

This whole deal sounds like a sh*t show from day one. Never mind leakdown. A well rebuilt Bridgeport should start well idle well from the first start. Something is not right for sure, sounds like the rebuilder is clueless.

Dave

[flabum1017]

This whole deal sounds like a sh*t show from day one. Never mind leakdown. A well rebuilt Bridgeport should start well idle well from the first start. Something is not right for sure, sounds like the rebuilder is clueless.

Dave

Yup, and if this motor is run in salt water, it will rust up and probably seize if let set for a month.........