Easy Guide: Changing The Oil Pan On A Chevy 235

If you're looking to install a new oil pan for your Chevy 235, you may encounter some challenges. While some individuals have reported difficulties in finding a suitable oil pan for their 1955 Chevy 235, others have suggested checking online platforms such as eBay, Facebook groups, or specialist websites like stovebolt.com and patricksantiquecars.com. It is also worth noting that there may be variations in oil pans depending on the year and model of your Chevy 235, so ensure you acquire the correct one. Additionally, when it comes to gasket installation, the use of a sealant is recommended to hold the gaskets in place while you refit the oil pan.

Using sealants to keep gaskets in place

Gaskets play a vital role in engine operations, creating a physical barrier between two parts. They prevent things like dust, dirt, fluids, gases, and electrostatic discharges from prohibiting your engine from running efficiently.

• Surface Preparation: Before applying any sealant, carefully clean and prepare both surfaces between which the gasket will be placed. Remove any remnants of old gaskets, glue, or adhesive. Use a brush or scraper made of plastic or nylon, or a chemical cleaner, to avoid scratching the surface. Scratches can provide a channel for fluids or gases to leak through.
• Choosing the Right Sealant: Different applications require different types of sealants. Do your research to select the appropriate sealant for your specific application. For example, in cars, trucks, and gas-powered tools, use a solvent-based gasket maker rather than an aerobic gasket maker, as gasoline breaks down aerobic sealants.
• Applying Sealant: When applying the sealant, use a bead thickness of around 1/8". Apply it evenly in a continuous bead to each surface. Remember, using too much or too little sealant can lead to problems.
• Curing Time: Follow the manufacturer's instructions for curing or drying times. Standard silicone sealants typically require curing times ranging from two hours to a full day. Anaerobic sealants usually take about an hour to cure.
• Consider Gaskets with Adhesive Backing: Some gaskets are supplied with adhesive backing, allowing for perfect placement and no slippage when fitting. This stable adhesive only adheres where you want it and won't extrude or leak into unwanted areas.
• Compatibility: Be cautious when using sealants with certain types of gaskets. For instance, coated gaskets that don't require sealants may deteriorate if silicone sealant is also used. Always check compatibility to avoid leaks and other issues.
• Filling Gaps: If you're dealing with large gaps, consider using a silicone or RTV gasket maker. These sealants will provide a tighter seal without any air pockets.
• Surface Condition: If the mating surfaces are pitted or damaged, sealants can help compensate for imperfections. However, be cautious when using sealants with delicate flanges, as removing the sealant can be challenging and may damage the surface further.
• Preventing Slippage: Sealants can be useful for preventing gaskets from sliding out of position during torquing. For example, the accepted industry method for paper and cork gaskets is to use aviation gasket sealant or similar spray-on products.

Remember, while sealants can help keep gaskets in place, incorrect usage can lead to gasket failure. Always follow manufacturer recommendations and allow adequate curing times to ensure a proper seal.

Finding a replacement oil pan

Online Forums and Communities

Online forums and communities dedicated to vintage Chevrolet cars can be a valuable resource. These communities often consist of enthusiasts and experts who have experience in restoring and maintaining older Chevy models. Try reaching out on forums such as the Vintage Chevrolet Club (VCCA), Chevy Tri Five Forum, and Stovebolt.com. Members of these forums may have knowledge about specific parts or could point you in the right direction.

EBay

EBay is another option worth exploring. A simple search for "6 cyl chevy oil pan" or "oil pan 235 chevy" on eBay may yield some results. Keep in mind that the availability of parts on eBay can vary over time, so it's worth checking regularly if you don't immediately find what you're looking for.

Facebook Groups

Facebook groups focused on classic cars or specific Chevy models can be a great place to connect with other enthusiasts who may have leads on parts. Try searching for groups related to Chevy 235 engines or classic Chevy cars in general. You can also post a wanted ad in these groups to increase your chances of finding a seller.

Salvage Yards and Specialty Stores

Salvage yards, such as the one mentioned in a post on the Jalopy Journal forum (owenssalvage.com), can be a goldmine for hard-to-find parts. It's worth contacting salvage yards in your area or those that specialize in classic cars to inquire about oil pans for the Chevy 235 engine. Additionally, some forum members have suggested reaching out to specific stores like Patrick's Antique Cars (patricksantiquecars.com).

Wanted Ads

If all else fails, consider posting a wanted ad on sites like jalopyjournal.com or in local automotive classifieds. This can help spread the word about your search and increase the chances of someone reaching out with a suitable oil pan.

Remember to exercise caution when purchasing parts online or from unknown sources. Always verify the authenticity and condition of the part before finalizing the purchase. Good luck in your search for a replacement oil pan for your Chevy 235 engine!

Using thread to secure the gasket

To start, it is important to ensure that the oil pan has been removed from the engine. Completely clean all surfaces inside and out of all old gasket material, oil, sludge and metal shavings.

When it comes to using thread to secure the gasket of your Chevy 235 oil pan, there are a few methods you can use. One method is to use lightweight sewing thread to secure the gasket in place at several bolt holes. This will help to ensure that the gasket does not move while you are placing the bolts.

Another method is to use a sealant in addition to the thread. First, apply a sealant such as RTV or "The Right Stuff" to the rear of the block, timing chain cover, and gasket. Then, use lightweight sewing thread to secure the gasket in place through several bolt holes. The sealant will need to harden a bit before you continue.

It is recommended to also apply a gob of sealant where the rubber and cork gaskets meet, as well as on both sides of the gasket, to ensure a good seal and to make it easier for the pan to slide into place without grabbing the gasket. You can also smear some oil on the "half-moon" parts of the pan to help it slide into place more easily.

Once the sealant has hardened and the gasket is secure, you can then ease the oil pan into place and secure it with bolts and screws, torquing them to the manufacturer's specifications.

Differences between car and truck oil pans

The oil pan is an integral part of a vehicle's lubrication system. Attached to the bottom of the engine, it holds the oil that is circulated to keep the engine lubricated, reducing friction and preventing damage. The oil is pumped through a filter to remove dirt and debris before being circulated. The oil pan is usually made of steel or aluminium and can hold four to six quarts of oil.

Now, let's discuss the differences between car and truck oil pans.

Size and Capacity

Truck oil pans are typically larger than car oil pans to accommodate the bigger engines in trucks. The larger engine displacement requires more oil for lubrication, so the oil pans have a higher capacity.

Design and Material

Truck oil pans may have a different design and be made of more durable materials to withstand the increased stress and vibration from larger engines. They may also be designed to handle heavier loads and tougher terrain, which can include impacts from rocks or other debris. Car oil pans, on the other hand, may prioritise lightweight materials to reduce the overall vehicle weight and improve fuel efficiency.

Oil Change Intervals

Due to the larger capacity of truck oil pans, oil change intervals may be longer compared to cars. This is because the larger oil volume can provide sufficient lubrication for a longer period before requiring a change.

Mounting and Accessibility

The mounting and accessibility of the oil pan can differ between cars and trucks. Trucks often have higher ground clearance, which can make accessing the oil pan more challenging. Car oil pans are generally more easily accessible for maintenance and oil changes.

Cost and Availability

Given the larger size and different specifications, truck oil pans may be more expensive and less readily available than car oil pans. The replacement parts market for trucks may be more limited, impacting the availability and cost of oil pans.

In summary, truck oil pans are designed to cater to larger engines, heavier loads, and tougher terrain, while car oil pans focus on lightweight construction and easy accessibility. These differences influence the size, capacity, design, and cost of the oil pans, ensuring they meet the specific requirements of cars and trucks.

Oil pan installation

To install an oil pan on a Chevy 235 engine, follow these steps:

Firstly, ensure you have the correct oil pan for your specific Chevy model and year. For example, early 1955 Chevy blocks may use a different pan with a different bolt pattern compared to later models. You can source oil pans for the Chevy 235 from sites such as eBay.

Before beginning the installation, it is recommended to have the engine out of the truck, as it will make the process much easier. If this is not possible, you can still install the oil pan, but it will be more challenging to access everything.

Now, we can begin the installation process:

• Remove the old oil pan and inspect the pan around the 22 holes. Use a dolly and a flat body hammer to pound any holes that are not flat back into place.
• Scrape away all the old gasket sealer and residue from the surface of the pan mating surfaces. Ensure you have good lighting and take your time with this step.
• Clean the mating surfaces with lacquer thinner to ensure all oil residue is removed.
• If your bolts have a star washer, add a flat washer first to distribute the force and prevent the holes from bending. Then, add the star washer and the bolt.
• Apply gasket sealer to the engine side of the gasket, then place the cork side pieces on first, followed by the rubber end pieces. Add a dab of sealer at the rubber-to-cork junction.
• Wipe down the gasket surfaces with lacquer thinner again to remove any excess sealer.
• Bolt down the oil pan without applying sealer to the pan side. Tighten the bolts by hand only.
• The next day, remove the pan. This step is crucial to removing air pockets and ensuring a proper seal.
• Again, wipe down the pan with lacquer thinner and apply a coat of sealer all over the cork sides.
• On the ends, apply a more liberal bead of sealer to the pan or the engine, then hand-tighten the four larger corner bolts.
• Finally, finish tightening the remaining bolts by hand, starting in the centre of the engine on both sides.

By following these steps, you can ensure a proper seal and avoid leaks in your Chevy 235 oil pan installation.

Frequently asked questions