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Go Back   SailNet Community > General Interest > General Discussion (sailing related) > Perkins 4.154 Crank Pulley removal
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Thread: Perkins 4.154 Crank Pulley removal Reply to Thread
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Topic Review (Newest First)
01-28-2012 06:00 PM
dacap06 I'm sorry to have misled you with the manuals. It wasn't intentional. Looks like we have ALL learned something!
01-28-2012 04:30 PM
sea_hunter Yeah, that's an oddball for sure. I know the license built Perkins 4.154, it was imported into Canada in the Mazda B trucks and the Ford Ranger in the mid 80's. It's pretty much the same engine but with Mazda specific externals. What heat exchanger does it use? Just for future reference, ALL the Perkins part number beginning with USN or USM, are invalid. Since Cat bought Perkins, all part numbers have numerical references.
01-28-2012 03:36 PM
TYLERWCOM I have been stuck in this project because I decided to proactively replace the water pump since I had the front of the engine mostly apart.

Perkins had TWO versions of the 4.154. One they made and one that Mazda made under license. My engine number is A07_J13352U. The J means Japan and that means Mazda.

A good engine was made by Mazda I was told. But it is NOT the usual North American version with North American Accessories. The manual posted earlier in this link has the INCORRECT water pump part number listed as U5NW0053 (hand written) corrected to U5MW0053 (still not correct for a Japan engine). The good part number is 136315100A (Mazda) I have seen this NA version manual, with the hand written pump number, posted all over the web

I removed the entire water pump casting and took my manuals (also North American) to the Perkins dealer. One of them spotted the J in the engine number and said, "you have the Mazda version!"

A day later I had the perfect drop in pump unit !!
(learned more about Perkins than I wanted to, but now I know I have the Japanese version.)

Now on the the alternator project...
01-25-2012 10:19 PM
SloopJonB
Quote:
Originally Posted by sea_hunter View Post
Yes automotive serpentine belts require a loaded tensioner, the ones used on marine engines employing large case alternators do not. The belt goes around ALL the drive pulleys, but underneath the idler pulley. The tension is loaded with the alternator adjusting arm. The main reason it's done this way is that marine diesel engines don't operate at variable and higher engine RPMs (therefore no backlash that causes the belt to "jump") like automotive engines. Hope that helps.
Thanks - good to know.
01-25-2012 07:46 PM
sea_hunter
Quote:
Originally Posted by SloopJonB View Post
Indeed I don't (it IS a brute though). I've never seen a serpentine system without a powerful spring loaded tensioner - the one on my wife's minivan requires a breaker bar to unload the tension. How is tension maintained on the belt on the system you describe?
Yes automotive serpentine belts require a loaded tensioner, the ones used on marine engines employing large case alternators do not. The belt goes around ALL the drive pulleys, but underneath the idler pulley. The tension is loaded with the alternator adjusting arm. The main reason it's done this way is that marine diesel engines don't operate at variable and higher engine RPMs (therefore no backlash that causes the belt to "jump") like automotive engines. Hope that helps.
01-25-2012 06:39 PM
SloopJonB
Quote:
Originally Posted by sea_hunter View Post
There is NO tensioner with the 154 serpentine belt, only an idler pulley. And yes it is a requirement as big cased alternators require a lot of umph to turn; without the serpentine, they'll just squeal like a pig. My thoughts are that you don't own a 62 HP table saw.
Indeed I don't (it IS a brute though). I've never seen a serpentine system without a powerful spring loaded tensioner - the one on my wife's minivan requires a breaker bar to unload the tension. How is tension maintained on the belt on the system you describe?
01-25-2012 08:22 AM
chef2sail Not sure if this helps. We installed an electromax with smart regulator. They have pully kits for all enghines on their site. Was recopmmended by Mainsail over Balmar.


https://store.electromaax.com/index....tegory&path=38

Dave
01-25-2012 08:21 AM
chef2sail https://store.electromaax.com/index....tegory&path=38
01-25-2012 02:24 AM
sea_hunter
Quote:
Originally Posted by xort View Post
according to various sources, the 4.154 shouldn't have more than a 100 amp alternator. Too much loading on the bearings. You don't need a bigger belt for 100 amps. Run your idea past the perkins experts, TransAtlantic Diesel. they may have some good advice and/or parts you might need.
I don't know what sources xort is commenting upon; our 154 runs just fine with a 200 amp Balmar twin post and has done so so 5 years. Now that's a documented source. There are many Perkins experts and TAD sell the pulley kit for the 154 as well. The 154 is twice the engine as the 108-7 and almost 4 X better than many replacements as the 154 is a CD rated engine @3000 RPM. The Cummins and the Yanmar are ID engines rated 40% lower than the 154 which TAD recommends against installing a big case alternator. This is one of the main reasons I'm not choosing a Cummins for a choice as a repower. Make sure the belt is adjusted correctly as not to load up the FW pump too much.

Quote:
Originally Posted by SloopJonB
Do you need to change over to a serpentine system - big expense, tensioner is another potential problem to stop the engine far from home etc. . How about just changing to a quality cogged belt? They transmit a lot more power and run on v-belt pulleys. Made a BIG difference to my table saw.
There is NO tensioner with the 154 serpentine belt, only an idler pulley. And yes it is a requirement as big cased alternators require a lot of umph to turn; without the serpentine, they'll just squeal like a pig. My thoughts are that you don't own a 62 HP table saw.
01-24-2012 10:47 PM
xort according to various sources, the 4.154 shouldn't have more than a 100 amp alternator. Too much loading on the bearings. You don't need a bigger belt for 100 amps. Run your idea past the perkins experts, TransAtlantic Diesel. they may have some good advice and/or parts you might need.
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