How to checkbearing clearancewith Plastigage

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The clearance of the bearings will depend on the size of the engine but for a 900mm bore engine the clearance is between 0.40 and 0.70 mm with a maximum allowable of 0.9mm. Similarly for a 500mm bore engine the allowable clearance is provided as between 0.4mm and 0.55mm

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A marine engine comprises of several types of bearings which support the rotating and reciprocating crankshaft, camshaft, and cross head of the engine, enabling the marine engine to perform the desired operation of power generation. It is very important to maintain a good quality and quantity of lubricating oil to all these bearings in order to avoid breakdown of the engine.

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How to adjustmain bearing clearance

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Bearing Defect: If the journal of the crankshaft is fine but the defect is in the bearing itself, it may be due to following reasons:

If the timing belt is experiencing trouble the cogs crack and break off, causing the belt to move differently than the pulleys and change the mechanical timing. However, there are no clear-cut warning signs as to when the timing belt will go out. It often happens suddenly without warning, which is why it is recommended to replace this vital component at a certain age and/or mileage. Because the engine is so dependent on the timing belt, the engine will seize, stop running, or experience a significant loss in power. A chain will experience the same issues as well as make a considerable amount of noise.

The main bearing of a marine engine supports the long running crankshaft throughout the engine length. This makes it imperative to check the condition of the bearing at regular interval of time.

In engines like MAN B&W, this is the most common method used to measure the bearing clearance of the top shell. In this method there is no need to remove any connection or keep for measuring the clearance.

This method is used in SULZER 2 stroke marine engines where the bearing‘s shell is removed along with the keep (the bearing shell is lined with the keep). After that a bridge is fitted over the top of journal pin, from port to starboard, making a bridge over the crankshaft with two ends supported on the cross girder.

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This is a traditional method and to be used when no other alternative or tools are present. In this method, lead wire is inserted at different positions between bearing and pin. The bearing housing is tightened. Ensure not over squeezed the wire more than 1/3 rd of original diameter. General Method for taking clearance using lead wire:

This might give a clear picture: https://forums.marineinsight.com/forum/marine-engineering/3619-auxiliary-main-engine-big-end-bearing-clearance

All the modern bearings are usually of the thin wall type with non adjustable clearance. If the bearing clearance has reached it’s maximum limit or the bearing got damaged, it cannot be reconditioned and needs to be changed.

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You can prevent the misfortune of having a timing belt or chain go out while you’re driving, by having it replaced by recommendation of the manufacturer. Keep in mind, chain driven vehicles are dependent on oil viscosity. Lighter oils are designed to reach the smallest areas and components of the engine to ensure components are equally lubricated.

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Sir if clearance is more bearing is worn right. So by adjusting clearance by removing shims,won’t it affect bearing or it’s like using damage bearing and will result in engine damage??

Disclaimer : The information contained in this website is for general information purposes only. While we endeavour to keep the information up to date and correct, we make no representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability or availability with respect to the website or the information, products, services, or related graphics contained on the website for any purpose. Any reliance you place on such information is therefore strictly at your own risk.

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The telescopic gauge is inserted between the gap of the crank web and the bearing keep. When the tip reaches the shell top, the feeler is inserted between the shell and the pin to check the clearance.

A simple vernier type depth gauge is then inserted in the hole provided on the bridge and the scale of depth gauge is rested on the crankshaft pin. The total depth on the scale is measured and compared with the previous reading and the reading in the manual for calculating the wear down of bearing.

Hi can you please tell me fourth method Depth gauge from LO pipe screw in which SMC-C engine model? Because all the manuals I see it is telescopic gauge method.TIA

The camshaft in the engine controls the valves to let fuel and air in and out. At the same time, the crankshaft moves the pistons up and down. This is called mechanical timing and the synchrony of these functions is imperative. If the mechanical timing is off, damage could occur to the valves, pistons, engine, or other components. The purpose of the timing belt or chain is to ensure the harmonization by keeping each turning at the precise rate.

Journal Defect: A journal is a polished part of the crankshaft accommodating the bearings, helping the crankshaft setup to rotate. If the journal pin is defective, the bearing clearance will increase at a faster rate. Reason for journal pin damage:

In some engines, after removing the shell and the keep, the bridge is installed as explained in the above point. Also, in place of depth gauge, a feeler gauge is used to measure the clearance between the journal pin top and the bridge bottom. The bridge used here is different in terms of height and the gap between the pin and the bridge is very less as compared to that of the bridge used in the above mentioned method.

Main journal bearing clearancecalculator

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How to checkbearing clearancewith feeler gauge

It must have within the limit, if out of limit, the bearing shell must be replaced with new ones or readjust the clearance by adjusting shims.

There are various types of methods adopted by different marine engine manufacturers to measure the clearance of main bearing of marine engine. Following are some of the most prominent methods used onboard ships to measure the clearance of main bearing:

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Everything within your vehicle’s engine works with precision to produce a smooth and functional operation. In order to guarantee this specific timing, the timing chain or belt works with the camshaft and crankshaft to keep the motion of the valves and pistons working in perfect synchrony. While the timing belt and chain are used to produce the same action, there is a slight difference between the two.

Main bearing clearancetool

Main journal bearing clearancemetric

Newer vehicles equipped with timing belts can go up to 100,000 miles before requiring replacement. Older vehicles, on the contrary, should be replaced sooner, around 60,000 miles. Most technicians would advise that if the water pump goes out in your car, it’s best to replace the timing belt at the same time and vice versa. Typically, it’s recommended as most often the belt is removed in order to access and replace the water pump.

The timing chain functions in the same way that a timing belt does. The difference between the two is simply the material and location. One is constructed of metal and the other, a reinforced rubber. Though timing chains were used first, belts were introduced into vehicles in the 1960s. Belts are quieter and because of their material, less expensive to produce. Timing chains are housed within the engine and receive lubrication from engine oil and can last a long time, while timing belts are located outside of the engine and tend to dry out and crack. Within the last few years, however, more vehicle manufacturers have integrated timing chains back into some vehicles with vast improvements such as a reduction in noise and vibrations, different then a timing belt not all water pumps are driven by the timing chain. Check your owner’s manual to determine what kind of timing operation your vehicle utilizes as they may vary from year to year and by an auto manufacturer.

In old model SULZER engines, a collar is provided in the bearing shell along with a small hole.  Thus without removing the keep, the bridge is fitted adjacent to the keep and the depth gauge is used from the hole provided in the shell to measure the shell wear down.

enginebearing clearancechart.

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This method is used in new MAN B&W engines (SMC-C) which does not require the top keep to be removed. The lube oil pipe connection screw hole is in the bearing keep which can be  accessed from the hole on the bearing shell.

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If there is  metal to metal contact due to wiping of the bearing material, or dirty lube oil containing small metal particles- squeezing, scoring, cracking and pitting will occur on the journal pin

Main journal bearing clearancechart

Sales tax is additional. Most cars and light trucks. Service includes up to five (5) quarts of diesel motor oil for passenger cars and up to ten (10) quarts for heavy duty trucks, new oil filter and complimentary digital vehicle inspection. Vehicles requiring special oil or more than the standard amounts of oil may incur additional costs. Cannot be combined with any other coupon, offer or discount. Valid 12/1/2024 to 1/31/2025. Vast code OILM15D