Author Topic: Mercruiser 140 rebuild  (Read 47488 times)

0 Members and 1 Guest are viewing this topic.

Offline 75starflight

  • Hero Member
  • *****
  • Posts: 3517
Mercruiser 140 rebuild
« on: October 09, 2013, 11:16:37 PM »
I picked up an engine stand on the cheap yesterday for $20.00.  So I decided to start working on tearing down the 140 block I got from Joe to get it ready to go to the machine shop.

The engine stand I bought is only rated for 750lbs so I hope it is sturdy enough to hold the 350 for the CVZ18, when I get to building that.





Sent from my AT100 using Tapatalk 2
1975 v-179 starflite

Offline Rosscoe

  • Hero Member
  • *****
  • Posts: 4444
Re: Mercruiser 140 rebuild
« Reply #1 on: October 10, 2013, 06:15:49 AM »
Looks like the same cheap engine stand I have and it held a 350 long block but was hard to move around and didn't feel real safe.
Ross
61 Surflite 1964 90HP Johnson project
67 V163 Bayflite Super Sport  1989 100HP Merc
67 V164 Bayflite 120HP
67 V174 Crestflite Rat Rod
71 V175 Crestflite 350ci -Jet
73 GT 160
84 CVX 17  83 115 Merc
88 CVX-23 350 Mag

Offline Jason

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 5564
  • 1974 CV16SS, 1986 CV23
Re: Mercruiser 140 rebuild
« Reply #2 on: October 10, 2013, 07:11:22 AM »
Good luck on the rebuild.

Those engine stands look weak but can some how hold a lot of weight. Looks just like the one I had my 460 on which weighs about 650lbs.
Jason S.
1974 Glastron Carlson CV16SS 140 I/O
1986 Glastron Carlson CV23 260 I/O

Offline kert0307

  • Sr. Member
  • ****
  • Posts: 386
Re: Mercruiser 140 rebuild
« Reply #3 on: October 10, 2013, 08:39:05 AM »
Good luck on the rebuild, I'd watch how tippy that stand is with a single front wheel. The one I have has two up front, but it is still a HF cheapy and it held the fully dressed 302 fine. I did weld up support brackets to run it on the stand for break in though. Here's some motivation and you can see one of the brackets I made to support the front of the motor.

CVX16 V8 motor

Offline Jerry

  • Hero Member
  • *****
  • Posts: 2902
Re: Mercruiser 140 rebuild
« Reply #4 on: October 10, 2013, 08:47:48 AM »
Sounds like a steal. I've had one for 40 years with no problem. Check that #1 cylinder close. With the water pump blowing right on it, it tends to wear more than the rest.
'72 Glastron GT160 Sport - Okie-Dokie
'63 Winner - Grandpa's Fisn-Bote
'63 Glasspar SeaFair Sunliner - Mischief Maker

Offline Jason

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 5564
  • 1974 CV16SS, 1986 CV23
Re: Mercruiser 140 rebuild
« Reply #5 on: October 10, 2013, 09:09:17 AM »
Didn't notice the one front wheel. Mine had two. That does seem a little scary....

The 140 you can run on a pallet once you get the bell housing and front motor mount on.
Jason S.
1974 Glastron Carlson CV16SS 140 I/O
1986 Glastron Carlson CV23 260 I/O

Offline Rosscoe

  • Hero Member
  • *****
  • Posts: 4444
Re: Mercruiser 140 rebuild
« Reply #6 on: October 10, 2013, 09:28:07 AM »
Didn't notice the one front wheel. Mine had two. That does seem a little scary....


It is. A grain of sand on the floor can affect the caster.  Two would definitely be better.
Ross
61 Surflite 1964 90HP Johnson project
67 V163 Bayflite Super Sport  1989 100HP Merc
67 V164 Bayflite 120HP
67 V174 Crestflite Rat Rod
71 V175 Crestflite 350ci -Jet
73 GT 160
84 CVX 17  83 115 Merc
88 CVX-23 350 Mag

Offline 75starflight

  • Hero Member
  • *****
  • Posts: 3517
Re: Mercruiser 140 rebuild
« Reply #7 on: October 10, 2013, 09:38:28 AM »
For what I paid for it, I can always add a bar to the front and put 2 casters on it before the 350 build. I does roll well over all the cracks on the floor of my shop with out a problem with the single wheel and is very stable at the moment. I rotated the engine over to see what it would do and did not even try to tip.
« Last Edit: October 10, 2013, 09:40:42 AM by 75starflight »
1975 v-179 starflite

Offline 75starflight

  • Hero Member
  • *****
  • Posts: 3517
Re: Mercruiser 140 rebuild
« Reply #8 on: October 10, 2013, 09:41:26 AM »
Didn't notice the one front wheel. Mine had two. That does seem a little scary....

The 140 you can run on a pallet once you get the bell housing and front motor mount on.

I ran the 120 on a piano dolly before I put it back into Phoenix Rising this season after the rebuild.
1975 v-179 starflite

Offline 75starflight

  • Hero Member
  • *****
  • Posts: 3517
Re: Re: Mercruiser 140 rebuild
« Reply #9 on: October 10, 2013, 08:28:36 PM »
Pulled the oil pan over my lunch hour today, and it was a PITA. I found more of that blasted silicone gasket maker and I think the rest of the engine is put together with it too. :P

So when I removed the oil pan I found this



A milky oil mess.
 And all of the following






Sent from my AT100 using Tapatalk 2
1975 v-179 starflite

Offline Jerry

  • Hero Member
  • *****
  • Posts: 2902
Re: Mercruiser 140 rebuild
« Reply #10 on: October 11, 2013, 12:26:07 AM »
A lot of the newer GM cars, if you go to the dealer and ask for a gasket set, they hand you a tube of silicone. Don't use that much when you put it back together. LOL

'72 Glastron GT160 Sport - Okie-Dokie
'63 Winner - Grandpa's Fisn-Bote
'63 Glasspar SeaFair Sunliner - Mischief Maker

Offline MarkS

  • Hero Member
  • *****
  • Posts: 1062
Re: Mercruiser 140 rebuild
« Reply #11 on: October 11, 2013, 04:37:17 AM »
Eeeewwwww, what a mess Brandon!
Mark
1978 SSV-176

Offline Hyperacme

  • Administrator
  • Hero Member
  • *****
  • Posts: 13463
Re: Mercruiser 140 rebuild
« Reply #12 on: October 11, 2013, 08:41:20 AM »
Not lookin' good !

Offline Jason

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 5564
  • 1974 CV16SS, 1986 CV23
Re: Mercruiser 140 rebuild
« Reply #13 on: October 11, 2013, 09:46:26 AM »
Brandon, Are you hoping it's just a bad head gasket? Going to get block and head pressure tested? Look for cracks on the head or block surface from the cooling passage to the combustion chamber. Can you see down inside the block on the crank end and see any cracks from the water passage? Maybe it cracked internally rather than externally.
Jason S.
1974 Glastron Carlson CV16SS 140 I/O
1986 Glastron Carlson CV23 260 I/O

Offline fireman24mn

  • Hero Member
  • *****
  • Posts: 2060
Re: Mercruiser 140 rebuild
« Reply #14 on: October 11, 2013, 10:56:16 AM »
MMMMMMMMMMMMM  Chocolate milk.  Good to drink, bad for engines!
I think this has become an addiction.


1977 CV-23 I/O Full Resto complete
1976 CV-16 V8 Resto in progress
1985 Pearson MotorYacht 43ft

Offline 75starflight

  • Hero Member
  • *****
  • Posts: 3517
Re: Mercruiser 140 rebuild
« Reply #15 on: October 11, 2013, 11:52:06 AM »
Brandon, Are you hoping it's just a bad head gasket? Going to get block and head pressure tested? Look for cracks on the head or block surface from the cooling passage to the combustion chamber. Can you see down inside the block on the crank end and see any cracks from the water passage? Maybe it cracked internally rather than externally.

Head had three cracks on it. Machinest did not even have to magnaflux it, spotted them right away. Exterior of the block looks good. I plan on getting it  completely torn down, then having it checked out to make sure it is in good shape.
1975 v-179 starflite

Offline 75starflight

  • Hero Member
  • *****
  • Posts: 3517
Re: Mercruiser 140 rebuild
« Reply #16 on: October 12, 2013, 10:28:02 PM »
Got the block completely torn down this evening. Did a good inspection of the internal structure, I did not fin any visual cracks. The cylinders do need to be honed, and all the rod and main bearings show a fare amount of wear. A few rod bearings showed some signs of minor oil starvation. I will try to post some pictures. Probably won't get the parts to the machine shop until after the first of November.
1975 v-179 starflite

Offline 75starflight

  • Hero Member
  • *****
  • Posts: 3517
Re: Mercruiser 140 rebuild
« Reply #17 on: November 25, 2013, 03:20:30 PM »
Components are finally at the machine shop this afternoon. On first inspection by the machinist looks like it will be getting one reconditioned rod so far the other three will be inspected. Going to go with flattop pistons instead of the dished for more compression. New stock cam, 10 to 15 lbs heaver valve springs and stainless valves and add a set of full roller rockers. Oh, and balance the crank shaft and rods. Should have it back after the first of the year.
1975 v-179 starflite

Offline kert0307

  • Sr. Member
  • ****
  • Posts: 386
Re: Mercruiser 140 rebuild
« Reply #18 on: November 26, 2013, 09:05:58 AM »
I still have two rods/pistons left from the 140 I pulled out of my cvx16 if you need a rod. Did this with the other two...

Might want to save the remaining two before I desecrate them like the others ;)


Offline Jason

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 5564
  • 1974 CV16SS, 1986 CV23
Re: Mercruiser 140 rebuild
« Reply #19 on: November 26, 2013, 09:36:23 AM »
I still have two rods/pistons left from the 140 I pulled out of my cvx16 if you need a rod. Did this with the other two...

Might want to save the remaining two before I desecrate them like the others ;)



COOL! I need a plasma cutter....
Jason S.
1974 Glastron Carlson CV16SS 140 I/O
1986 Glastron Carlson CV23 260 I/O