anyone rebuilt a Mercruiser 140?

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lovetowrenchit
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Re: anyone rebuilt a Mercruiser 140?

Postby lovetowrenchit » Sat Nov 22, 2014 9:51 pm

Schurkey wrote:
lovetowrenchit wrote:this is good info, the 140s and 3.0 have 350 sbc block from what I understand

NO. The 153/151/3L all have an entirely different block design compared to the 350. The bellhousing bolt pattern on the 153 and 3L, and maybe the bore spacing is similar to the small-block.

As I said earlier, the 153 was a four-cylinder version of the 230 six-popper. This engine family was revised more times than I can count; but the 3L block seems to have more in common with the 153 and the six-popper than with the later versions of the 151.

[i]thanks for clarifying that for me, and I need to go find some info on the 230 six-popper, sounds interesting[/i]

lovetowrenchit
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Re: anyone rebuilt a Mercruiser 140?

Postby lovetowrenchit » Sat Nov 22, 2014 9:58 pm

I'm actually looking at pics, and reading about the 230 6 popper, good stuff

lovetowrenchit
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Re: anyone rebuilt a Mercruiser 140?

Postby lovetowrenchit » Sun Nov 23, 2014 9:16 am

lovetowrenchit wrote:I'm actually looking at pics, and reading about the 230 6 popper, and the 153, good stuff

lovetowrenchit
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Re: anyone rebuilt a Mercruiser 140?

Postby lovetowrenchit » Wed Apr 08, 2015 7:49 pm

Well, I thought I would update this thread

I did finally rebuild the Mercruiser 140 over the past few months and I'm pleased with the results, here are a few videos

sorry not quite sure on how to post a youtube video

1st startup after fresh rebuild
https://youtu.be/1J_dyGxS0Hk

here it is after about an hour of running, found out my Fel-pro 2 piece rear main seal stared to leak
https://youtu.be/1ShdjVVn4Uc

here it is after re-installing a new GM 2 piece rear main seal and setting the electronic base timing
https://youtu.be/RCJJJrkQne8

rmyauck
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Re: anyone rebuilt a Mercruiser 140?

Postby rmyauck » Mon Aug 07, 2017 1:02 pm

Hi,

Does anyone know if the 1987 head from my 3.0L (has dished D shaped pistons) will work on a similar year 3.0L rebuilt .060 short block (it also has a 2 piece rear seal and my flywheel will bolt up) I found that has flattop pistons (the owner claimed it had those) or will the compression ratio be too high? I could use premium fuel (91 pump) no problem.

I see a site showing 2 part # s for their replacement quicksilver heads, with one for 1963-94 and the other for 1990 and up having a different part #

Thanks!

Randy


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