Mercuiser 140hp stern drive

[fishrdan]

Re: Merc 140hp 71 Compression

Re: Merc 140hp 71 Compression

fishr 450 for the head to be machined and valve job,

Exactly what are they doing for $450? ($450 seems excessive)

I paid $250 10+ years ago for a 140 head rebuild, but all parts were replaced including the hardened exhaust seats and high performance undercut valves. 2 years ago they did a valve job on it, only springs and retainers were replaced, and it cost $180, which seemed a bit high to me, but oh' well... The total machine shop bill from 2 years ago was around $500, including a crank grind, tanking block, boring the block, pistons pressed, cam gear pressed, cam bearings installed.

I know this isn't 10 years, or 2 years ago, but $450 seems high for head work, even with the economy in the crapper and prices going up.

Rod inserts = piston pins?

 

[Ryanlewis2010]

Re: Merc 140hp 71 Compression

Re: Merc 140hp 71 Compression

well 450 is on the high end if there is more then the basic stuff or anything he went high on purpose based on the fact he really had no clue what the condition or anything about the head was so ill get a good price either way my boat mech. wanted 750+ on the low end

 

[artificialreef]

Re: Merc 140hp 71 Compression

Re: Merc 140hp 71 Compression

Holy Schmoly Ryan. You've got this whole motor apart and you want to hone the cylinders and slap it back together. My friend, do it right and mike the cylinders and then when you see the results are a little weird have the machine shop mike it. Then set you up with a working bottom end.

 

[artificialreef]

Re: Merc 140hp 71 Compression

Re: Merc 140hp 71 Compression

What will happen is you will hone it and put it back together and those worn out crank shaft bearings will continue to let that crank slap around. Then youll pull it again and replace what you should have done the first time.

 

[artificialreef]

Re: Merc 140hp 71 Compression

Re: Merc 140hp 71 Compression

Well in all fairness not everyone has an inside diameter cylinder mike handy. I worked in a combustion engine machine shop when i was a youngster.

 

[Ryanlewis2010]

Re: Merc 140hp 71 Compression

Re: Merc 140hp 71 Compression

ohhhh noooo nooo artificical i think somewhere up there i said i was gonna re do the bearings and everything basicly a whole rebuild short of new pistons and boring im doing this right the first time its my project that i wanna say i did it right lol so if it fails i cant blame anyone els lol (i have a habit im tryin to brake doin that). But in other news i drooped the head off today he will give me a call tommorow or monday with a realistic price then when i clean everything up and hone it ill have them tank the motor so its gonna be perfectly clean. Trust me when i say i wanna do it right so if you see something i might have left out please point it out and ill look into it, but thats my update for tonight. also do you think for the strendrive it would be better to just buy a new unit for 1300 and just sell my old one as is for like 300 since i dont know the condition besides last i knew it worked fine. let me know thanks

p.s. did i mention the out drive would be comming from IBoats.com (gotta love our great forum provider) with a 3 year waranty

 

[artificialreef]

Re: Merc 140hp 71 Compression

Re: Merc 140hp 71 Compression

I dont think you are supposed to hone anything untill it comes out of the tank clean. Hopefully the machine shop you took it to will tell you what you need.

 

[artificialreef]

Re: Merc 140hp 71 Compression

Re: Merc 140hp 71 Compression

Put your honer away for now, until the machine shop gives you some direction.

 

[Ryanlewis2010]

Re: Merc 140hp 71 Compression

Re: Merc 140hp 71 Compression

ooh ok see thats why i asked here because this is my first rebuild and i figured you honed first then tank it to clean any shavings blah blah blah u get it lol thanks when i get the head prices ill ask them about that and how much a tank down would cost any one out there done it recently to give me a price? also are there any performance upgrades i could do i asked about port and polish he said dont waste the money for this engine he said he rebuilt plenty and it doesnt add enough noticeable power to money ratio lol let me know

Thanks ryan

 

[artificialreef]

Re: Merc 140hp 71 Compression

Re: Merc 140hp 71 Compression

The shop i worked in i dont think we even charged for hot tanking. We made our money from telling you what you needed (and we didnt rip people off). Cleaning is minimal. This was in 1984 maybe we charged 15 bucks at the most. You have a cool little motor there.

 

[Ryanlewis2010]

Re: Merc 140hp 71 Compression

Re: Merc 140hp 71 Compression

Hey guys its me again been a little while hope you all had a great holiday season i know i did(NOT lol) I hate how tourist have to come to CFL just be cause its warm and we have theme parks i mean really, well any ways back on topic i have the engine completely disassembled and in the shop right now they just had it tanked and installed some new brass freeze plugs. but i wanna know if i decide to bore it can i get a .03 piston or do i even need to, the reason i ask is the shop will bore it .03 for me for 80 dollars but i dont think i can get .03 pistons and i would rather not sleeve is possible (btw this is all hypothetical cuz i will have them mic it and see if it needs it) and any one wondering this is a different shop then the one my head is at if they dont call me by tomorrow or haven't touched my head im gonna bring it down here cuz they will have everything done by tomorrow. well thanks for all the help.

 

[Ryanlewis2010]

Re: Mercuiser 140hp stern drive

and just to clear things up what will be done tomorrow will be just the engine block NOT the head (that was dropped off a month ago and still not a word on how much it will be) n incase you forgot its a '71 GM 3.0L mercuiser long block

 

[fishrdan]

Re: Merc 140hp 71 Compression

Re: Merc 140hp 71 Compression

i wanna know if i decide to bore it can i get a .03 piston or do i even need to, the reason i ask is the shop will bore it .03 for me for 80 dollars but i dont think i can get .03 pistons

They are referred to as .030 or "30 over" pistons, readily available, but kind of spendy though, probably $150 or more for the set.

 

[Ryanlewis2010]

Re: Merc 140hp 71 Compression

Re: Merc 140hp 71 Compression

Thanks fisher actualy i just got back from my machine shop i decided to over bore it to 30 over and there gonna supply me all my parts (a lot cheaper) all for around $630 Dollars Now this includes the following parts and labor:
Hot Tank 65
freeze plugs 12
Bore and Hone 90
Pistons .030 $33x4
Rod Bearing 4.8x4
Main bearing 45
ALL GASKETS 147.00
Rings 48
Cam Bearings and instalation 18
Install Pistons on rods 12
So that brings my Grand total on the Rebuild to around 800 give or take.

Oh and on another note i was gonna pick my head up today and take it to my new shop cause i thought they hadnt even touched it, come to find out as i walked in the door they were tagging and bagging it. All for 153.5 includes brand new everything and cleaning the works!!!

Edit:
and it will all be done and ready for building on friday(gotta love getting the week off without asking for it)

 

[Ryanlewis2010]

Re: Mercuiser 140hp stern drive

Well me again i just thought i would give you guys and update i managed to get EVERYTHING back from the shop today.
Thank god this owner thought ahead and orderd the stuff even thou i told him idk if ill need it... but any ways if any one lives in CFL and needs there motor work done right hit me up for the number. Well now to the fun stuff PICTURESSSSSS


fresh off the truck


Mounted and ready to go (sorry blurry cam)

Brand new pistons and a new rod(some how the motor ran with a mis-matched rod and cap with out seizing it was way out of wack so i got me a new one)

And eveything going in to this boat will be the best of the best so it has brass plugs.

 

[Ryanlewis2010]

Re: Mercuiser 140hp stern drive

and here is one last one of the gasket kit that came with everything from the head bolt gaskets all the way down to the oil pan DRAIN plug gasket

 

[Fishermark]

Re: Mercuiser 140hp stern drive

Good luck and have fun! Sounds like you have a good machine shop.

 

[Ryanlewis2010]

Re: Mercuiser 140hp stern drive

Yeah i love these guys now if only i had the time (and money) to find another engine to rebuild lol

 

[Ryanlewis2010]

Re: Mercuiser 140hp stern drive

well im about a few days away from getting everything all up and running so here is my new status
This was last night i was to busy watching the pats kick tebows but lol to post my update

and this is what kept me from getting it running to day my sisters TOY had a few bad wheel bearings

And this where we stand right now

 

[Ryanlewis2010]

Re: Mercuiser 140hp stern drive

Well got pretty darn FAR today in fact i imagine it to be running sometime this weekend well as u all request more PICTURESSSS