SailNet Community - Reply to Topic

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel > Performing compression test on Penta
 Not a Member? 


Thread: Performing compression test on Penta Reply to Thread
Title:
  

By choosing to post the reply below you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Topic Review (Newest First)
11-25-2012 12:31 AM
bljones
Re: Performing compression test on Penta

porfin, as is often the case, has the right idea- build a dummy injector., or, go with your gut- id it runs, doesn't smoke, isn't hard to start, screw it, replace the head gasket, torque down the head, keep on top of oil changes, and run her until she dies.
11-24-2012 11:16 PM
CalebD
Re: Performing compression test on Penta

I am also a firm believer in doing vinegar flushes of my raw water cooled Atomic 4 engine.

Hopefully your Penta is in good internal shape. A big problem with Volvo engines seems to be parts availability and prices for same.

If you are not married to the idea of having a diesel engine (probably best for the type of cruising you are contemplating) you could consider re-powering with a working Atomic 4. Older but working A4's seem to sell for around $1K. It is also a gasoline engine which many consider anathema.
11-24-2012 10:34 PM
hellosailor
Re: Performing compression test on Penta

Blackstone Labs

Probably the biggest independent source for oil analysis, but a lot of distributors and shops also sell the kits. You mail them off.

If you're going to pull it out of the boat...Might as well clena up the engine bay, think about installing fuel polishing lines, expect to pull the engine apart and do work, as well as sending out the injectors. And replacing the mounts.There's a lot that can be done, and should be considered if the engine is being pulled, but I'd hate to say "pull an engine" before you knew whether it really needed to be pulled at all. Lots of time and money that might not be needed.
11-24-2012 08:23 PM
bobmcgov
Re: Performing compression test on Penta

Misfits: We'll probably have an outboard (or a Torqueedo) for the dink; I plan to arrange the swim ladder to mount the outboard, in an emergency. It's a reverse-transom IOR boat w/ typically high counter, so conventional O/B brackets don't work so good.

HS: thanks for the info. Boat is not in the water & is unlikely to be until launching in CA. We may pull the engine in April & run it on a pallet. Right now it is winterized & it probably needs to stay that way. What I can see of the coolant passages suggests some surface rust, but not too bad. Might run a warm vinegar mix thru the block in Spring for about three straight days. Our local kids are pretty sharp little wrenchers, some of them -- and they'd have a instructor looking over their shoulders if we submitted the engine for rebuild. It's a bone-simple engine -- might have a go at it myself. Who performs oil analysis? Do you have to mail it off, or can a local garage do it?

The guy who delivered the boat said it smoked pretty bad; the haulout yard thinks the injectors just need cleaning; I think the boat might be overpropped a touch. It has an aftermarket 14x9 Gori folder. IIRC, the original prop for this engine was a 12" folder. Hard to not overprop a 10hp engine!
11-24-2012 08:02 PM
hellosailor
Re: Performing compression test on Penta

bob, salt water eats blocks. Fresh water is no big deal.

Why not just fire it up, see how the engine runs, see if it moves the boat at hull speed at a reasonable rpm without smoking, and if everything looks good, let it be?

Then after you've put some hours on it, spend $25 on the oil analysis to find out if the engine is chewing itself up, etc. If a diagnosis was important to me, I'm not sure I'd want to have trainees doing it. By definition, they lack the experience to really know what they might be looking at.

With four years on the timeline, check out a class at Mack Boring on diy diesel maintenance, you may find that invaluable for the big trip, and it will teach you what to look for on your own engine in the meantime.
11-24-2012 07:42 PM
misfits
Re: Performing compression test on Penta

I've got an MD7A on our 28 & it does run. If having mechanized propulsion isn't a big priority, you could always toss an outboard on her stern & save $$. It's crossed my mind.
11-24-2012 07:19 PM
bobmcgov
Re: Performing compression test on Penta

Quote:
Originally Posted by misfits View Post
If you're planning on heading out across the big blue sea, start saving your money for a motor replacement. Somewhere along your travels, you'll be glad you did.
Hence the 3-4 years we want to squeeze out of the Penta. That's how long (at a minimum) we expect to spend in and around Mexico. Northern MX is a perfectly good place to repower -- inexpensive yard fees, close enuf to the US we could even drive a new engine down there, and full of skilled mechanics and machine shops. Affordable help, too. I just paid a Midwest marina over $2000 to haul the boat out of the water, squirt some antifreeze thru the pipes, unstep the mast, and plop the boat on a trailer. Maybe six hours total labor. Rather too proud of their work, are US boatyards.

We either have to repower here, while the boat is in the back yard, or after we've got it to Mexico. We don't generally motor if we can possibly avoid it anyhow, and we won't carry refrigeration or a watermaker that requires engine charging. And I refuse to call a marine auxiliary engine a safety feature, because that sort of thinking gets people killed. It's helpful, verging on necessary, for getting into and out of some harbors. That's about how we view the engine.

It's telling that this MD6A, at a mere 10hp, was not considered particularly undersized for a 7500# sailboat in 1975. Albin did upgrade to a 13hp motor later. People sailed more.
11-24-2012 05:11 PM
misfits
Re: Performing compression test on Penta

If you're planning on heading out across the big blue sea, start saving your money for a motor replacement. Somewhere along your travels, you'll be glad you did.
11-24-2012 01:13 PM
bobmcgov
Re: Performing compression test on Penta

Quote:
Originally Posted by CalebD View Post
So Bob, where will you be sailing your new-ish Albin 30'?

You are right about the Volvo OEM parts. Enough of those and you could buy a Beta marine brand new diesel (~ $6K). Kubota tractor dealers carry most of the replacement parts at a major discount.
Three or four years to refit completely, then down to the Pacific. Probably keep the boat in San Carlos, MX. Would like to hit Vanuatu, Tonga, someday. That's a ways off. Need to replace those sketchy thru-hulls first. Adore the Beta engines. Outside our refit budget, tho.

PorFin: Thanks! I might try that approach. We also have a huge number of eager, impoverished young diesel mechanic trainees in town (big technical college). I might find a couple of them to run the diagnostics, maybe overhaul the injectors, maybe even the whole engine. Tho again, we don't want to pour too much into an engine that has a) been fresh-water cooled its whole life, albeit in the Great Lakes; and b) will be an ongoing source of trouble/expense. I'd like a solid notion of what hours it has left before we commit to major repairs or modifications.

Suppose "ongoing source of trouble/expense" pretty much describes marine engines in general....
11-24-2012 11:30 AM
dabnis
Re: Performing compression test on Penta

Before going to all that work, you might consider an oil analysis, supposedly it will show worn bearings and/or rings in addition to unburnt fuel contamination.

Paul T
This thread has more than 10 replies. Click here to review the whole thread.

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


All times are GMT -4. The time now is 10:41 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.