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  Topic Review (Newest First)
10-10-2015 04:42 PM
S1monb111 Hi a couple of questions. How long is the alternator turnbuckle modification and has anyone encountered excess wear on the return spring and the hole it goes through which is mounted on the tab on the timing cover from the fuel pump stop?
10-09-2015 08:46 PM
SloopJonB
Re: Perkins 4.108M DIY Rebuild -- A Narrative

Those are smooth steel (usually) and don't suffer the same cling effect that raw cast iron does - the whole purpose of the paint is to speed oil drainback to the pan. It goes a long way towards keeping the oil clean as well - just rub some oil on a piece of cast iron and see how quickly it blackens.
10-09-2015 05:40 PM
eherlihy
Re: Perkins 4.108M DIY Rebuild -- A Narrative

Quote:
Originally Posted by PorFin View Post
[B]...

As SJB suggested, I decided to seal the areas of the block and head with Glyptal. Lots of varying opinions out there in the interwebs about the wisdom, utility and benefit of doing this; some folks swear by it, others raise worries about the paint coming loose and plugging up the oil pump and/or oil galleys. Others raise worries about the paint's insulating properties retarding heat transfer from the oil out through the block and oil pan. What ultimately swayed me in favor was that it had been done to this engine before and it looked to be holding up just fine.

...











A few comments about Glyptal. First, this is an alkyd enamel that was developed for use as an insulator for electrical coils and armatures. It has a very high resistance to heat, and plays well with oil. It's also pretty viscous -- 60% solids by weight. ...

Related to this, I have been working on two M25s (not my own) and was surprised to see that Kubota painted the oil surfaces of the D-850 block with Glyptal too! Sadly it was not used to coat the interior of the valve cover or the oil pan.
10-09-2015 03:42 PM
S1monb111 Thanks! I'll get some more images next week . Yup it's a 50ft Mel Davis hull about 1997. Our home too. I reckon the engine is very old but runs nice just needs some TLC!
10-09-2015 01:31 PM
SloopJonB
Re: Perkins 4.108M DIY Rebuild -- A Narrative

Narrowboats are so cool and yours looks like a nice one.

But please....learn to rotate pics before you post them - my neck doesn't rotate well anymore.
10-09-2015 07:03 AM
S1monb111
Re: Perkins 4.108M DIY Rebuild -- A Narrative

in the UK
10-09-2015 07:01 AM
S1monb111
Re: Perkins 4.108M DIY Rebuild -- A Narrative

This is very useful, many thanks. I have a 4108 in the UK in a narrow boat. Would you guys like some images?
Doing some overhaul work but not as deep as the images shown.
04-28-2015 02:18 PM
PorFin
Re: Perkins 4.108M DIY Rebuild -- A Narrative

Quote:
Originally Posted by eherlihy View Post
Bump!

Now that PorFin is back, I want to know how it turns out - before he gets distracted again...
Patience, my friend, patience.

Let's see...

- House in VA renovated and sold? Yep -- just closed a couple of weeks ago.
- Off crutches and starting to walk again? Yep, albeit with a very aggravating limp.
- New abode in FL selected and purchased? Not yet. As one might guess, the wife's got this pretty much at the top of "our" (which translates into "my") priority list.
- Quick commute to work on the boat? Not so much -- it's about 12 hrs door-to-boarding ladder.
04-28-2015 01:29 PM
eherlihy
Re: Perkins 4.108M DIY Rebuild -- A Narrative

Bump!

Now that PorFin is back, I want to know how it turns out - before he gets distracted again...
01-30-2015 09:50 AM
eherlihy
Re: Perkins 4.108M DIY Rebuild -- A Narrative

Dude, you realize that you started this epic in December of 2012... Twenty five months ago...

We want pictures!!! (motor-porn).

I'm glad you're back!
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