Cadillac 4100 Engine Problems

The noise is characteristic of this 41 liter ht4100 engine. Agreed basically the engine was an 80 368 all steel engine the computer and rocker solenoid devices were the issue as the transition to 8-6-4 was very slow and caused customer complaints.

What Maintenance Should I Be Doing On My 85 Eldorado To Avoid Ht4100 Failure

This noise is very common on this engine and will clear up when replacing 1 main bearings but might return after you put some miles on it.

Cadillac 4100 engine problems. Unfortunately for Cadillac customers would not remain pleased with the new engine for long. If you dont know when this was last done do it now. 2 Engine was just plain tooo wimpy for the mass it was trying to pull around.

For 1987 a more powerful version of the 41 L engine was introduced in the Cadillac Allanté using a different camshaft profile and roller lifters to provide for improved airflow in addition to multiport fuel injection. Remove strut rods connecting engine mounts to flywheel cover. Someone told me that there were some kind of.

Complete engine failure manifests itself usually in two ways. Without proper maintenance water would leak in to the engine and ruin the bearing etc. Replacing the somewhat buggy Ht 4100 engine with one of our bug fixed newer versions is.

This engine was then superceded by the TBI 305 Chev and an optional TBI 350 Chev. Despite problems with the engines Cadillac still had annual sales in the United States above 300000 as late as 1986. The most common years of the head gasket issues for the Northstar engines are 19097-1999 with the 2000 change of Cadillac lengthening the head bolts severely reducing the prevalence of the issue in Northstar engine cars.

The 4100 is basically the same engine as the 45 and the 49. These engines were unrealiable and underpowered. Originally intended for use in the 1984 front-wheel-drive Caddys the HT-4100 was quickly reworked and fitted to the full-size Broughams and DeVilles with the introduction of the 1982 models.

This engine had two big problems 1 Engine requires regular coolant changes and you must use the GM sealing tablets. I recently heard the Cadillac HT 4100 was updated or improved in 1985 to prevent the common head gasket failures. Pleasant is far from what.

Internal upgrades include a. Too underpowered to call it a Cadillac engine and they dropped these into long-and. I fixed a lot of these as a cadillac.

Here is what I heard 85 Eldorado HT4100 engines VIN 623772 and up were reengineered to eliminate previous head gasket issues. The block studs went fron the bottom of the block up through the heads and tyied the entire assembly pretty tight together. Anyways I have this 82 and the HT 4100 that was in it was shot I know that these motors were crap in the first place and did a little bit of looking and found rebuild Forum that discussed replacing an HT 4100 in an 82 with a 368 which happened to be the exact motor that I found.

This engine was rated at 170 hp 127 kW at 4300 rpm and 235 lbft 319 Nm. It had a very lightweight aluminum block with cast iron heads. The HT-4100 was a quickie replacement for Cadillacs ill-fated V8-6-4 modulated displacement engine introduced in 1981.

I own a 1985 Cadillac Eldorado with a HT-4100 engine. Then as you reach intermediate speeds on a street or avenue and your power requirements lessen the car automatically switches to 6 cylinders. You might email these people Cadillac Remanufactured Engine Blocks and see what they offer.

The HT4100 camshaft is also weak and prone to failure. Mileage was not as good as the HT series but no engine issues at all. Less and less power until the car can barely get out of its own way or bam followed by coasting to the shoulder.

Posted September 14 2008. This decreased the chance of having the failure but did not completely eliminate the issues showing how the Northstar engine remained bad in the following years. After a couple of years of production Cadillac issued a recall to try to address the block porosity problem.

Remove six engine to transmission screws then remove motor mount through bolts. Additional issues included oil-pump failures and head bolts pulling free of the block. Problems originating from the used of different metals in the block and head became pervasive often resulting in head-gasket failures.

The engine was a 60 litre 368 cubic inch V8-6-4 fuel injected engine -4 fuel injected engine. Oil pressure can disappear entirely on early 1993 to 1994 engines as a result of debris caught in the the finicky oil pressure relief valve. Disconnect oil cooler lines from filter adapter then remove filter adapter.

The 86-90 RWD Cadillacs actually swtiched to an Olds 307 V8 from the 4100. The problem lies in the 1 main bearing clearance. The HT4100 was prone to failure of the intake manifold gasket due to scrubbing of the bi-metal interface aluminum oil pump failure cam bearing displacement weak aluminum block castings and bolts pulling the aluminum threads from the block.

The HT4100 was yet another example of GMs ability to engineer but not execute engine-wise and it was the third failure for Cadillac within a very short timespan. GM fixed a lot of these problems in the 2000 model year but earlier engines are known to develop leaks around the main seals and valve covers. It was intended to put in those downsized FWD c-body Cadillacs but they were delayed so the RWD models had to run for another year without an engine which HT4100 took place in.

The HT-4100 was rushed into production to replace the electronically-problematic otherwise mechanically robust V8-6-4 engine. GM was too focused on saving weight and built a poor engine. As you leave your driveway all 8 cylinders in your gasoline-powered 1981 Cadillac are in operation.

I understand that they were riddled with problems.

Cadillac High Technology Engine Wikiwand