Perkins 4.108M DIY Rebuild -- A Narrative - Page 11 - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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  #101  
Old 02-20-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

Chapter 13: Finally Catching a Break

Well, the weather relented a bit and I was finally able to get a little paint sprayed yesterday.

Here are most of the aluminum parts that needed an initial primer coat of zinc chromate.

Oil pan and bell housing:



Intake manifold and oil filter bracket:



Exhaust mixing elbow, fuel filter shousing and fuel lift pump:



With the oil pan primed, I was able to start putting the block back together.









Once the pan was back on, I had to trim about 1/16" of the cork gasket that goes around the front and rear main bearing caps. Very quickly and cleanly done with a wood chisel:





Next piece to go on was the timing backing plate:





(If you look closely, you'll notice that most of those bolts holding the backing plate on have some flat washers stacked -- that's temporary. There are four bolts that are in to stay, but the rest will need to come back out as they are the ones that secure the perimeter of the timing cover. I did, however, need to get clamping pressure on as many places as possible to make sure the gasket sealant got a good grip to the block.)

FWIW: I used Permatex Aviation gasket sealant on all the gaskets. Seems to have a good reputation, and hopefully will stand the test of time.

Looking like I'll be able to get the head back on tomorrow.
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  #102  
Old 02-27-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

Chapter 14: Another Week, Another Distraction

Well, as usual life has intervened and demanded attention. I got some wind damage to the house a storm or two ago, and my neighbor was really anxious for me to take care of it. You see, we live in a three level townhouse, and a piece of flashing came loose and was scraping across said neighbor’s roof right above their bed. I had to rent a 34’ extension ladder to get up on the roof, and since I was already out the rental cost decided to do a decent inspection and fix any gripes I discovered. What a great idea! Well, that turned into an “as long as we’ve got the ladder…” evolution that made for a quickly growing list of projects that were difficult to ignore. What’re ya gonna do?

Anyway, here’s the Perky Update:

Threw on the head gasket:





Got the head on and torqued her down to specs:





While SJB recommended painting only after assembly is complete, I decided to move ahead before I got that far. There are a couple of reasons: Firstly, there a many parts on this engine that would simply prevent me from getting a decent paint covering on the entire block. Second, some of the parts are just easier to spray while off of the engine.

First job is the primer.

Now, keeping in mind SJB’s lament of having bare metal showing after his paint job, I took the time to mask carefully and selectively.

Here’s what I did. The injector pump is the biggest offender when it comes to interfering. I masked over the opening, then loosely bolted on the gasket.



I then trimmed around the gasket with an X-acto knife and removed the tape I didn’t need. Took off the gasket, covered the bolt holes, and she’d ready to rock.



I did the same thing for the rocker cover, the intake manifold opening, the water pump, the tappet cover opening, and the exhaust manifold opening.

Now, another area that needed special measures are the recesses for the injectors. If I had sprayed paint with the injectors installed, there’s no way I could get paint down in the holes without either missing spots or worse yet flooding the paint in there. I trimmed some cork stoppers and used them as plugs.





After all the masking was done, I then cleaned the block (several times) with mineral spirits. I would have preferred to use brake cleaner, but I discovered that it removes zinc chromate primer – DOH!

Then it was spray, spray and spray some more. Three coats total: mist coat first, slightly heavier second coat, then a healthy third coat.





I also used the gray primer over top of the aluminum parts I’d already hit with the zinc chromate to make sure I get a uniform final color when the top coat goes on:



And no, that’s not fog gathering in the garage – just a lot of primer in the air.

Funny story, that... Turns out that the door seal between the garage and the house doesn’t seal too well, and the boss was not really keen on my purty paint work when she got home. It took a while for the house to air out enough that I wasn’t forced to sleep on the couch (although it was touch and go for a while...)

Stay tuned for more progress.
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Last edited by PorFin; 02-27-2013 at 09:22 PM.
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  #103  
Old 02-27-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

Personally I HATE the smell of paint, or other VOC. Although the mroe I snewll it hte betttrre I fleel abasout the smmszell.

MedSailor
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  #104  
Old 02-28-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

What is the brand of grey primer you are using? What will be the top coat?
Regards
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Old 02-28-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

This is looking GREAT. (Maine Sail - eat your heart out.)

Once your through with the Perky, how would you feel about trying your hand at a Universal M25? I think that I can find one somewhere...
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  #106  
Old 02-28-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

Just wanted to thank you again for such meticulous documentation of this project.. great job, looks great and as SJB hinted earlier almost makes me want to have to do the same (so I can try to do as good a job!!)
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  #107  
Old 02-28-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

Porf, I like the improvements you made on my advice - those "blanketed" areas on the 108 were not a factor on my Chevy. The way you corked the injector wells was a great idea.

I think you can see what I was getting at where the bits of block show around the oil pan rail and the corners of the block deck under the head.

It's looking great - keep it coming.
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  #108  
Old 02-28-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

I'm in awe of your undertaking, looks great...I hope it starts
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

Quote:
Originally Posted by T37Chef View Post
...I hope it starts
You and me both, amigo, you and me both...
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

Quote:
Originally Posted by casey1999 View Post
What is the brand of grey primer you are using? What will be the top coat?
Regards
For primer, most parts are getting rattle can DupliColor Engine Primer. A couple of hang-on parts (like the brass oil change pump) I'm gonna see how Rustoleum hi-temp self-etching primer does.

For the top coats, I'll be using Eastwood's Engine Enamel.

I did the initial coat with a brush on a couple of test pieces today (like the dipstick tube), just to see how it flowed out and what kind of results a brush would yield. I'll let those puppies dry for a min of 24 hrs, and then hit them again with a second coat.

I'll be spraying the block, but not for a little while yet.
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