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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Bon-ami engine rering in a can?

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mark anderson

01-06-2007 15:16:23

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Anyone have any experiences using bon-ami to seal up ring's on an engine? I have a couple of detriots 3-53's in Dynahoe backhoe's that are a little tired just not really crazy about putting an abrasive in a running engine. thanks in advance Mark Anderson

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Don K.

01-07-2007 06:13:01

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Re: Bon-ami engine rering in a can? in reply to mark anderson, 01-06-2007 15:16:23

I have a D7-17A that was overhauled a while back. One of the pre combustion chambers was leaking water and it pulled the top off one of the pistons.Put new pistons and liners heads redone, to make a long story short, spent a lot of money on a old dozer, but it keeps me out of the beer joint.I worked it hard for about 25 hours right after thatand now have alittle over 100 hours on it.It seems to use a lot of oil for a like new engine, do you think the Bon Ami route is the way to go?

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Don K.

01-08-2007 05:19:46

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Re: Bon-ami engine rering in a can? in reply to Don K., 01-07-2007 06:13:01

Thanks OLD MAGNET I'll put some more hours on it and see what happens. Thanks for your help earlier on a source for clutch discs for my #25 cable control.

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Old Magnet

01-07-2007 08:40:14

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Re: Bon-ami engine rering in a can? in reply to Don K., 01-07-2007 06:13:01

Hi Don K,
100 hours is not enough to conclude there is a problem.
From the Service Bulletin:
If normal oil consumption is not obtained on new or rebuilt engines in 200-300 hrs under average operating conditions or 400-500 hrs under light load conditions, the following treatment is suggested:

Loosen the air cleaner to allow a gap between the mounting flange and the intake manifold. Run the diesel engine at about 800 rpm. Introduce the desired quantity of "Bon Ami" very slowly, then tighten the cleaner and continue to run the engine for thirty minutes. The engine is then ready for service.

The recommended quantity of "Bon Ami" for new rings with new liners for the 5-3/4 bore 4-cyl engine is three level full teaspoons.

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Old Magnet

01-06-2007 21:37:18

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Re: Bon-ami engine rering in a can? in reply to mark anderson, 01-06-2007 15:16:23

Yes, Bon-Ami was an acceptable service procedure with Cat as outlined in their 1948 service letter. Used to seat new rings that for some reason did not seat after normal expected period. Also was used to clear slobbering of diesel engines due to excessive idling or light load use that caused glazing of cylinder walls. Practice was abandoned on later engines with the improvements in piston rings. Not a substitute for worn rings and cylinders.

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Grabatire

01-06-2007 19:36:12

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Re: Bon-ami engine rering in a can? in reply to mark anderson, 01-06-2007 15:16:23

In my last year of HD Mechanics our instructor told us about this method, then to back it up he showed us a Caterpillar Manual that had a part number for the product and next to that, in brackets (Bon-Ami).

I used it once on a customers JD 3020. We had done a major on it and after explaining why, I instructed him to take it home and work it before putting it on the hay rake. Well you quessed it. He went right to raking and it didn't break in. He wasn't upset with us, he admitted to screwing up.

We put it on the dyno and gave it the bon-ami treatment and it turned out to be a good engine.

We also did some oil burners too. It helped a few for the short term, but not all.

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jdemaris

01-06-2007 17:48:44

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Re: Bon-ami engine rering in a can? in reply to mark anderson, 01-06-2007 15:16:23

I saw it used many times in the Deere shop I worked in during the late 60s and 70s. Usually used on "problem" engines that had been rebuilt but were sucking oil. Did it actually work? I doubt it - but cannot say for sure. I just stood way back when it was being used. Usually, the grease-monkey involved was already mad at the engine - so the stuff got dumped down the intake and the engine run to the max with smoke coming out all over. Most of the younger guys in the shop didn't care to use it (like me). The old-timers swore by it. If you've got a tired 3-53, it probably needs a lot more than Bon Ami. I've got two tired 3-53s here - but they keep on running. Biggest fear is the oil-pressure drops to near zero when hot and low RPMs.

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MSM

01-06-2007 16:52:27

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Re: Bon-ami engine rering in a can? in reply to mark anderson, 01-06-2007 15:16:23

It used to be done,but on the large slow running 4 cycles. Not recommended on a detroit because it has to go through the blower first.

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Bob Plumadore

01-06-2007 16:52:07

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Re: Bon-ami engine rering in a can? in reply to mark anderson, 01-06-2007 15:16:23

I remember the bon ami trick, it was not for used engines, it was for rebuild. if after rebuilding a cat engine you had excessive oil consumption shake a litte bon ami in to the intake it was to hasten the seating of the rings to the cyl walls. I only used it once in over 40 years. I would not recommend it on a detroit. by the way the 71 series is about the easiest and cheapest engine there to overhaul.

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Billy NY

01-06-2007 16:38:19

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Re: Bon-ami engine rering in a can? in reply to mark anderson, 01-06-2007 15:16:23

Caterpillar lists on page 99 of the servicemans reference book for the D-8800 4 cyl. engine, which was used in 3 other applications besides the old D7 tractors. It says to use 1 1/4 teaspoons for each cylinder, take the jar off the pre-cleaner and feed it in, let run for 30 minutes at 800 R.P.M. - (these were only 900 R.P.M. engines) This was a practice used besides honing or etching to hasten the seating of new rings to worn liners. They had their own part number for what was called break in powder.

This practice was shortlived and soon abandoned from what people say, but I had heard of this before I found it in a manual, powder was rumored to be Bon-Ami, not sure if true or what, also not sure what kind of results they were getting, can't imagine how this would translate to a detroit motor, but I think Caterpillar was where the practice started, unless other manufacturers also did it back in the day.

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